Talking about puzzles-questions about the riddle of dinosaur extinction

Let's take a look at the following several statements about the mystery of dinosaur extinction:

The end of the Chinese Era
This is because many dinosaurs are too large compared to us humans, so we all have to think about why they grow so big? It's also because there are so many types of dinosaurs that look so strange that we can't help wondering how many members are there in the huge family of dinosaurs?
Another more important reason is why so many dinosaurs that once lived on the earth with great vigor and vitality disappear from the earth without leaving their descendants, but it left us with a difficult mystery. This mystery will always inspire us to explore and learn.
Now we know that the extinction time of dinosaurs was 65 million years ago. At that time, not only did all the dinosaurs that ruled the earth for more than 0.1 billion years have been extinct, the same tragic fate has also come to the Earth's land, oceans, and many other creatures living in the sky. In this disaster, marine crawlers, such as the snakeskin and so on, flying crawlers, such as the iron and so on, and relatives of land crawlers, such as the color lizard, were extinct, the species of micro-floating animals and plants in the ocean, such as jushi and arrow stone, are almost wiped out by calcium-floating Kong Insects and calcium-micro-floating plants. After this big disaster, about 50% of biological species and nearly 75% of biological species on the Earth disappeared forever from the earth.
This is a big disaster. The result of the extinction has led to a fundamental change in the face of the biological world on the earth around 65 million years ago. The extinction marks the end of the modern era, and the geological history of the Earth has entered a new era-the new generation.
After unremitting efforts, scientists analyzed and studied all the clues that can be found so far, and put forward various theories to explain this extinction phenomenon. But so far, there is still no correct answer to the cause of this extinction.
Maybe, this answer is waiting for you to look.
Below, we will introduce some theories and theories about the causes of the extinction of dinosaurs, that is, we will introduce some basic background knowledge to you, I also hope to provide some inspiration for your better explanation.

I.MeteoriteCollision description:
More than 65 million years ago, a huge meteorite hit the Earth, causing the Earth to reach 0.1 billion million years of dinosaurs. This theory was proposed by four scientists, including Louis albayes, from the University of California at Berkeley.
This huge meteorite is about 10 kilometers in diameter. The crater terrain caused by the impact is two hundred kilometers in diameter. If the energy produced by the impact is converted into yellow explosives, it is equivalent to 100 trillion tons (megaton ). Dust spreads through the atmosphere to a layer. As a result, the earth went dark for several months. During this period, many creatures, headed by dinosaurs, were extinct.

Ii. comet collision:
"Comet collision" is an ancient biological scholar, David? Laup and John? The topic "the ancient species of life happen once every 26 million years" published by sepkky was created at the beginning. Louis? Arbarrez sent this argument and his theory to the celestial physicist-Charlie? Ruila, then ruila, thought it was due to the gravity of the Sun's half-star AVG, which periodically pushed the comet to the Earth.

III. The orgency movement said:
At the end of the last period of the shorhood, the swamp dried up, and many dinosaurs home on the swamp could not survive. Because of the changes after the gas, plants have changed, and grass-based dinosaurs cannot adapt to new foods, but are extinct. The grassland dinosaurs are extinct, while the meat-eating dinosaurs also lose their support, and the results are extinct. This extinction process lasted 1,000-20 million years. By the end of the shalth period, the Earth was extinct.

Iv. Climate change description:
As a result of plate movement, the current has changed, which has caused a huge change in the climate. The cold climate killed plants and the lack of food by dinosaurs led to extinction.

5. the volcano said:
Due to the explosion of the volcano, a large amount of carbon dioxide is sprayed out, causing the Earth's extreme greenhouse effect and food death. In addition, volcanic fires allow salt to be released in large quantities, the ozone layer is broken, and harmful ultraviolet rays are exposed to the Earth's surface, causing biological destruction.

6. ocean tide retreat:
According to buck, when the ocean surges and land borders, creatures are in contact with each other, thus leading to a species of creatures. Kangaroo, for example, can survive on an island continent like Europe, but it is declared extinct when it encounters other animals on the South American continent.
In addition to the relationship between eating and eating, there are also infectious problems such as diseases and parasites.

7. Warm Blood animals said:
Some people think that dinosaurs are warm-blooded animals, so they may not be able to survive the cold period of the late period. Because even if the dinosaur is warm and bloody, the temperature is still not high, and may be similar to the temperature of the current tree otters, to maintain such temperature, it can only survive in tropical climate zones. At the same time, the respiratory organs of dinosaurs are not perfect, they cannot fully supply oxygen, and they do not have thick hair to avoid loss of body temperature, but it is easy to lose a lot of heat from their long tail and long feet. The difference between warm-blooded animals and cold-blooded animals is that if the temperature falls below a certain range, physical energy will be consumed to increase the temperature, and the body will soon become weak. They are too large to go into the cave to avoid the cold, so if the cold days continue for a few days, it may be because of the exhaustion of physical strength and the fate of freezing.

8. Kill said:
Some people think that the real cause of the extinction of dinosaurs is the result of their killer-meat-eating dinosaurs feed on grass-eating dinosaurs, meat dinosaurs increase, and grass-eating dinosaurs naturally become fewer and fewer, and finally disappear, meat-eating dinosaurs because there is no meat to eat, they killed each other and finally fell victim to it.

9. Oppression theory:
The number of dinosaurs rapidly increased. In the case of a limited number of plants, it led to the extinction of the grassland-eating dinosaurs. Then, the meat-eating dinosaurs that made a living by eating the grassland-eating dinosaurs also died due to lack of food. (Doubt: Why does a dinosaur suddenly increase after an ecological balance of about 0.2 billion years? The key to the establishment of this theory has also directly led many scholars to review the causes of abnormal increase in dinosaur production .)

10. The breastfeeding prisoner said:
In the second half of the middle of the era, it was already the ancestor of mammals. According to the records of the fossil, the number of mammals at that time was very small, and the number was also very limited. It was not until the end of the period that the number began to increase rapidly. It is assumed that they belong to miscellaneous diets that use insects and other staple foods. After discovering the eggs of dinosaurs, these small mammals will continue to eat them.
(My Opinion: Is that true? If the mammals beat the dinosaurs, as the number of mammals increases, the number of dinosaurs should gradually decrease. But in fact, this phenomenon of fossil alternation does not occur. As recorded in other books, the real increase in mammals was after the end of the age of dinosaurs. Moreover, the fossil of dinosaurs suddenly disappeared. Therefore, it cannot be true that dinosaurs are wiped out by mammals .)

11. Aging:
It is believed that as a result of the boom of more than 0.1 billion thousand years, the body of dinosaurs is too bulky. In addition, the angle and other bones are also abnormally developed, which leads to great inconvenience in life and finally leads to extinction.
The most representative of the dinosaur, Lei long, has a length of 25 meters and a weight of 30 tons. Because of its huge size, he lost his life ability due to slow movements. In addition, due to the constantly expanding three corners and the abnormal development of bones and other parts protecting the head, the triangle dragon and others go to the path of self-destruction.
(My Opinion: not all dinosaurs are so huge, and there are small dinosaurs with a length of about one meter. In addition, there are also dinosaurs with bones like deer that can run bridly. But why is this dinosaur extinct? Moreover, it is advantageous to speculate in cold-blooded animals that it can absorb external temperatures and release the body's heat to regulate the body's temperature. As a result, I am skeptical about the aging of dinosaurs .)

12. Principle of Alkali:
This theory assumes that the final period of the survival of dinosaurs, that is, the time series, began to show flowers, some of which contain toxic hormones. dinosaurs died of poisoning due to a large amount of food. Because mammals can distinguish toxic plants by taste and smell, but dinosaurs do not.
However, the plants containing the alkali did not suddenly appear in the Late-cut-back period, which was available 5 million years before the extinct dinosaur species. This theory does not show how dinosaurs can survive during this period.

In addition to the twelve statements above, there are also little-known statements, such as "infectious diseases", "radiation from the universe or the explosion of a supernov", "not on Noah's Ark", and "solar system vibration, that is the best way to say it. There are no right or wrong ideas based on the ideas of each person. After all, the mystery of the destruction of dinosaurs has not yet been truly solved!

The two most worthy of discussion are as follows:Theory of the impact of an minor or meteorite, large-scale submarine volcanic eruption

Planetary impact theory
At a scientific seminar in 1980, American geographer arvalec and others vividly presented a thrilling story that occurred 65 million years ago: a sunny afternoon, in the tropical forests under the scorching sun, many different types and forms of dinosaurs walk quietly as usual or by the lake, or feed in the water on the edge of the forest, A newly hatched duckbill is walking back and forth on the nest of the eggs in an open wilderness. A overlord dragon is preparing to jump to a huge triangle dragon ......
Suddenly, a loud bang that never was heard broke the peaceful world. A meteor several kilometers in diameter hit the Earth. This was an incredible hit, equivalent to the explosion of tens of thousands of atomic bombs. This is an unexpected minor, and the impact force generated after the collision with the Earth can reach 1015 tons of energy produced by the explosion of TNT. A huge mushroom cloud with a volume of Dust quickly rose, rushed straight to the sky, then dispersed, and finally covered the whole earth. Soon, the dinosaurs could not see each other, because the dark clouds had no sunshine during the day. This horrible situation lasted for a year or two. The photosynthesis of plants is interrupted, so a large number of withered and dead. The vegetarian dinosaurs that eat plants died one after another. In the future, dinosaurs who eat meat will also become extinct because of their loss of food.
This story is the essence of the theory about the destruction of dinosaurs caused by the impact of an minor on the earth. Later, they were continuously supported by many scientists. Some scientists even thought that the earth had not only experienced a major planetary impact during this period, but also suffered many minor but still serious life-threatening minor impacts, it can be confirmed the traces of planetary impacts found in the Caribbean and the United States.
Evidence of this hypothesis also comes from the presence of an amino acid in sediment 65 million years ago found around the world. This amino acid contains a large number of iridium elements that exist in some celestial bodies, but should not exist on the earth. Many regions in North America, Europe, and Australia have successively discovered this layer of iridium-rich strata, which were also found several years ago in the okaba region of Tibet.
Some scientists believe that this explosion has destroyed all dinosaurs. However, some scientists believe that only 70% of the dinosaurs were extinct at the time, while other types of dinosaurs were barely escaped, but they were gradually extinct in the following millions of years. This post-statement is not unreasonable because some dinosaur bones were still found in the formation of the incident 65 million years ago. For example, a dinosaur was found in the upper and lower strata of New Mexico 60 million years ago. In the new generation of Frozen Soil in Alaska, it was also found that the fossil of the triangle dragon. These phenomena seem to indicate that some dinosaurs struggled for millions of years after the big bang caused by the impact of the minor on the earth, the last reason is that they are gradually extinct because they do not adapt to the new climate and the new environment.

Latest theory-large-scale submarine volcanic eruption
The famous Italian physicist Antonio zikiki recently proposed that the cause of the extinction of dinosaurs is probably the large-scale submarine volcano explosion.
Professor Qi Keji believes that at the end of the shalth period, the Earth experienced a series of large-scale volcanic outbreaks under the ocean, which affected the heat balance of sea water and caused land climate changes, this affects the survival of animals such as dinosaurs that require a large amount of food to survive. His reason is that the impact of the modern submarine volcanic eruption on the ocean and atmosphere is well known, but its impact is much smaller than that of the submarine volcanic eruption that occurred 65 million years ago.
Professor Qi Keji believes that in the past, the scientific community had little knowledge about the volcanic eruption at the bottom of the sea, and now it is necessary to conduct an in-depth study on the phenomenon that seriously affects the Earth's environment. For example, Greenland used to grow dense vegetation, but when the global water temperature balance changes, the cold ocean flow flows through Greenland, since then, this large island has become a land covered by ice and snow. This is a typical example of the impact of water temperature balance on climate. Submarine volcano activity is an important factor affecting the change of ocean water temperature balance. Therefore, Professor Qi Keji believes that the water temperature balance caused by the large-scale explosion of submarine volcano should be used as an important reference for studying the extinction of dinosaurs.
Reproductive Frustration Theory and Evidence

At present, the ancient crawling egg fossil, especially the dinosaur egg fossil, has been found in many parts of the world. According to the morphological structure, dinosaur eggs can be divided into short round eggs, elliptical eggs and long-shaped eggs. The size of a dinosaur egg varies greatly. The thickness of the eggshell, its internal and external "decoration", the structure of the eggshell, and the ratio of the vertebral and column layers in the shell layer are different. In order to conduct in-depth research on the internal characteristics of dinosaur eggs, scientists have adopted many new techniques and methods, such as scanning electron microscopy, X-ray diffraction, polarized microscope, and CT scanner. In recent years, Chinese scientists have used medical CT technology for the first time to study the non-invasive internal structural characteristics of dinosaur egg fossils unearthed in Laiyang, Shandong Province, some dinosaur eggs in Laiyang, Shandong Province were found to have dinosaur embryos that could not be observed by other methods.

Laiyang dinosaur egg
Shandong Laiyang dinosaur egg fossil color is gray-black, shape oval, one end is blunt, one end is sharp, the maximum length is 98mm, the maximum diameter is 70mm, the minimum diameter is 60mm. The eggshell has a rough surface and a few cracks. During the excavation, a small amount of eggshells fell off, while a small amount of brown-red powder-sanded mud was attached to the surface of the eggshell. The eggshell thickness is 2-3mm. The ge9800 Medical full-body CT scanning machine is used for cross-sectional scanning, which can clearly distinguish the contour and location of the egg shell, egg protein and yolk, and observe some very well-formed plasma in the intestinal stage. The embryo tray is located on the protruding side of the egg, near the egg edge of the egg. It is about 80mm long and about 8mm thick.
Deep research into these dinosaur eggs has led researchers to believe that the extinction of dinosaurs is related to their reproductive frustrations. The failure of reproduction is the problem of hatching a large number of dinosaur eggs.
According to the dinosaur eggs produced in the native layer, there is evidence that dinosaurs have a nest of ovulation habits, less than a dozen, more than dozens. This kind of high egg rate is an ecological strategy that ensures the normal hatching quantity and maintains the normal survival quantity of young children. In ecology, it is called the r selection strategy.
In terms of the genetic characteristics of dinosaurs, we need to consider the singularity of populations. Most of the large vegetarian dinosaurs live near the lush vegetation source, and the breeding ground will not be far away from their living areas. The huge bodies and dependence on water bodies make it difficult for them to perform long-distance migration, in a relatively stable and favorable environment, there is no need for long-distance migration. In this way, over time, it will inevitably lead to a decrease in the chance of crossbreeding of the dinosaur population. As a result, the population is purified to form many local species. Evidence can be found from ancient biology research. The purification of populations reduces the hatching rate of eggs to some extent. When a dinosaur lays eggs, the age is too small or too much is not conducive to the hatching of eggs. The health of the body also affects the hatching rate.
In terms of dinosaur eggs, being too heavy or too light is not conducive to hatching. Because the volume of eggs is proportional to its weight, the eggs of the same dinosaur species are too large or too small for hatching. Therefore, the hatching rate of the same egg must be lower than that of the egg. For short round eggs and long-shaped eggs, the variation range of the size of Short Round eggs is smaller than that of Long-shaped eggs. From this perspective, the hatching rate of Long-shaped eggs should be lower than that of Short Round eggs. Of course, long-egled dinosaurs can make up for these shortcomings by increasing the egg production rate or improving the eggshell structure. However, whether it is a short round or long-shaped egg, the egg shape is another factor affecting the hatching rate. The egg hatching rate is not high if it is too long or too circle. From the dinosaur eggs in Laiyang, Shandong province, the above problems appear more or less.

Eggshell thickness is another important factor affecting hatching rate. The eggshell thickness of the same type of egg generally has a certain range of changes, for example, the eggshell thickness of the Short Round egg is large, about 2mm. However, in the short circle eggs found in Laiyang, the eggshell thickness unearthed in the lower layer is large, and the eggshell thickness in the upper layer is obviously reduced. The average eggshell thickness of Long-shaped egg is 0.9 to 2.0mm, which is thinner than that of Short-round egg. It is not conducive to hatching if the eggshell is too thin or too thick. Existing data shows that the bottom-up dinosaur egg become thinner in the strata not only in Laiyang, but also in other regions of China and Europe. Some egg shells are less than 1mm thin, especially shell egg in late chalk. It is difficult to guarantee normal Hatching of such eggs. Therefore, it is certain that a large number of dinosaur eggs are not incubated when the dinosaurs are extinct in the late S.

The internal quality of eggs also has an important impact on the hatching rate. Most crawlers breed differently from birds, and parents cannot take the initiative to hatch eggs with their own temperature, it depends mainly on the heat energy provided by the sun, and Its hatching process is also affected by environmental factors such as temperature and humidity. According to the burial of the native layer dinosaur egg fossil, after the dinosaur egg was produced, the formation was generally subjected to continuous deposition without seeing traces of agitation and transportation in the later stage, this shows that after a dinosaur lays eggs, it is likely to use the surrounding sand to cover the eggs like a crocodile and other crawlers to protect them from pollution or invasion, then, it can only be controlled by the environment but enter the incubation stage. According to the CT scan of the dinosaur eggs in Laiyang, Shandong province, the existence of the gas chamber does not seem to be visible. The existence and size of the gas chamber can indicate the duration of laying eggs. The egg fossil without a gas chamber indicates that these egg production soon stops the hatching process and dies, and then enters the petrochemical stage of the fossil.

All of the above phenomena indicate that dinosaurs in the late s had serious problems during the hatching of eggs, resulting in the destruction of dinosaur reproduction. Researchers from these dinosaur eggs believe that this reproductive setback is likely to be the root cause of the extinction of dinosaurs.

Climate change theory
According to deep-sea geological drilling, some scientists believe that the earth's climate had changed abnormally 65 million years ago, and the temperature suddenly rose. This change makes cold-temperature animals, such as dinosaurs, unable to adapt well to the environment and cause endocrine disorders in their bodies, especially serious damage to the reproductive system of male individuals. As a result, the dinosaurs could not breed any offspring, so they could not survive.

Another theory is that although the sudden change in climate caused the extinction of dinosaurs, the process of speculation is different. These scholars believe that about 70 million years ago, the Arctic Ocean was completely isolated from other oceans by land, in the last days, the salty sea water gradually became fresh water due to various factors. By 65 million years ago, the "embankment" that separated the Arctic Ocean from other oceans suddenly broke out. A large amount of water in the Arctic Ocean that fades down into other oceans. Due to the low water temperature in the Arctic Ocean, these "overflow" cold water forms a layer of cold flow, which rapidly reduces the sea temperature of the Earth's oceans by about 20 degrees. The decline in ocean temperature has seriously affected the climate of the Mainland and cooled the air over the mainland. At the same time, the water vapor content in the air also decreases rapidly, resulting in a common drought on land. The integrated structure of these climate changes on land is that dinosaurs are extinct.

One possible cause of sudden changes in climate is the destruction of dinosaur eggs. Some scientists have found that at the end of the shortest period before the extinction of dinosaurs, the egg of dinosaur eggs has become thinner, indicating that there was a sudden climate change before the extinction of dinosaurs. Some ancient biombies in China also found that, among the dinosaur eggs produced from some fossil sites, the pores on the dinosaur egg near the extinction period are fewer than those in the dinosaur egg shells of other periods, this is probably related to the cold and dry climate.
Atmospheric Composition Change Theory

Tortoise
The extinction of dinosaurs at the end of the last period of the series is a fascinating phenomenon in the history of biology. Scientists have come up with one theory after another to try to explain the cause, but so far there is no conclusion that everyone can accept. The popular saying is that disasters caused by the impact of an minor on the Earth have led to the extinction of dinosaurs, but this theory is not perfect. Because dinosaurs were the most successful animals on the Earth at that time, their diversity was also varied in size, form, and lifestyle. If the disasters caused by the impact of the Minor Planet cause the extinction of dinosaurs, so why are turtles, crocodiles, and lizard crawlers closely related to dinosaurs able to survive today? This cannot help but encourage people to look for other ideas to analyze the cause of the extinction of dinosaurs.

Crocodile
Modern scientific analysis tells us that, in the distant age just formed by the Earth, there was basically no oxygen in the air, but the carbon dioxide content was very high. Later, with the emergence of self-sustaining organisms, photosynthesis began to consume carbon dioxide and make oxygen, thus changing the atmospheric environment on the earth. At the same time, on the one hand, carbon dioxide deposits coal and petroleum in the formation through bio-fixation, and on the other hand, it deposits in the form of various Carbonate through organic or inorganic processes. This kind of deposition is ongoing.
There is evidence that there is a high concentration of carbon dioxide in dinosaur life, but the concentration of carbon dioxide in the next generation is low. Is this change in atmospheric composition related to the extinction of dinosaurs?

Lizard
As we all know, every creature needs to live properly in an appropriate environment. Changes in the environment can often lead to the rise and fall of a species. When the environment is conducive to this species, it will flourish and develop; otherwise, it will decline or even disappear. Environmental factors include temperature, water, and air composition. So Will changes in atmospheric composition affect the life of organisms? The answer is yes. For example, human beings are at high levels of carbon dioxide, and some animals are even more sensitive to changes in carbon dioxide concentration.

In the modern era of dinosaurs, the carbon dioxide content in the atmosphere is high, indicating that dinosaurs are very suitable for the atmospheric environment with high carbon dioxide concentration. Maybe they can live well only in that atmospheric environment. At that time, although mammals had emerged, they had never been greatly developed. Perhaps this is because the atmospheric composition and other environments were not very beneficial to them, as a result, they have been in a weak position and slow development in the Chinese era. With the passage of time, at the end of the shalth period, the atmospheric environment has undergone great changes, the carbon dioxide content decreases, and the oxygen content increases. This adverse environment for dinosaurs may be reflected in two aspects: 1. the dinosaur's body is unwell. In the new environment, it is easy to get sick, and the disease will spread like a plague. 2. The new atmospheric environment is more suitable for the survival of mammals, and mammals become more advanced and adaptable competitors. Under these two factors, the dinosaurs eventually went extinct. Crawlers are the minority crawler species that can adapt both to the old environment and the new environment.

Therefore, for the extinction of dinosaurs, the impact of the Minor Planet may play a role, but it does not seem to be the most critical factor.

The theory that the atmospheric composition changes cause the extinction of dinosaurs has two starting points: one is that the atmospheric composition of the modern era is different from that of the modern era. Modern science can prove this. Another is that each creature needs an appropriate atmospheric environment to survive. Modern science is not difficult to verify.

In ancient times, there was almost no oxygen in the atmosphere, and the carbon dioxide content was very high. Later, due to the emergence of organisms, the process of gradually decreasing carbon dioxide content and increasing oxygen content in the atmosphere under photosynthesis may explain many phenomena in the history of biological history. For example, the explosion of Cambrian life is also a hard nut to crack in ancient history. Changes in atmospheric composition can also be explained, because animals cannot directly use inorganic compounds for photosynthesis, its origin lags behind that of plants, and the oxygen content in the atmosphere must reach a considerable level. Therefore, the explosive growth of Cambrian life must be guaranteed to a certain extent by the oxygen content in the atmosphere, which has been proved by science.

The latest report of the American Geological Society ---
The extinction of dinosaurs is a mysterious century for scientists. Many scientists speculate that cosmic substances have repeatedly hit the Earth, leading to the destruction of dinosaurs. However, after analyzing the sediment at the bottom of the Atlantic Ocean, a US research team believes that a single collision with an minor planet is the real cause.
The discovery was detailed in the November 30 Report on the US Geological Society Bulletin website.

■ Discovery
Research Director Ken? "Our findings strongly support single impact assumptions," said mclaud ."
Scientists discovered that the rare chemical element iridium exists on the Earth 26 years ago in the shalth period, and iridium is a common chemical composition element of the Minor Planet, which allows scientists to speculate that at the time of the shalth period, it hit the Earth, to bring iridium to the Earth. Later, scientists discovered that the qikowb crater, about 180 km in diameter, was also found in the lower-Cut Period of the Yucatan Peninsula, Mexico. This made scientists think that the crater is the product of the impact of an minor on the earth.
To collect evidence, the researchers analyzed five sample sediment rocks at the delilara sea hill under the Atlantic Ocean Surface about 2800 miles (about 4500 km) from the yukarat peninsula impact point.
Demilara haiqiu is an ideal site for researchers because it is a moderate distance from the crater. If the sampling location is too close to the crater, the collected samples may not reflect the current situation due to the post-impact tsunami, earthquakes, landslides, and other reasons. If the sampling location is too far away, there is little evidence of the impact in the rock.
The researchers said there was only impact-related substances in rock formations about 65 million years ago, none of which were longer and lighter years ago. This indicates that only one event has occurred when an minor hits the Earth. "This is a very clear single impact event," mclaud said ."
The researchers believe that an minor about 6 miles (about 10 km) wide earlier than 65.5 million years ago struck the Earth at the end of the last period of the series, forming a qikower crater, leading to the extinction of dinosaurs.

■ Explanation
Scientists have explained how the impact of an minor on the earth caused the extinction of dinosaurs.
The rapid attacky of an minor planet into the earth caused a drastic change in the earth's environment. The huge impact threw a large amount of rock and dust into the air. An earthquake occurred in the earth, a tsunami occurred in the ocean, a frequent volcanic eruption, and many forests were swallowed up by fire.
The dust floated in the air for dozens of years, making it difficult for the earth to accept adequate sunlight, resulting in a sharp drop in the number of plants, resulting in the collapse of the food chain from the bottom layer. At the same time, the earth is getting colder due to the weakening of sunlight, and the rain has fallen into the surface of the Earth due to hot acid rain, which poses a great challenge to the living environment of animals and plants.
Dinosaurs that have dominated the earth for 0.16 billion years cannot adapt to environmental changes and are naturally eliminated. From the canglong and snake-neck dragons living in the ocean, the winglong flying in the air to all kinds of land-based life dinosaurs were not spared. In addition, many ancient creatures, including jushi and marine floats, are also extinct in this catastrophe.
Birds and mammals have been hit hard but survived. The hot-blooded animals with long hairs on the surface eventually replaced the dinosaurs and became the dominant node of the earth, laying the foundation for the birth of mankind.

Note: The above content is referenced from the internal content in http://baike.baidu.com/view/3232.htm.

In fact, either way, I personally think it is one-sided. That is to say, we all agree with the well-known "theory of the impact of an minor or meteorite ". Is it possible that a collision of an minor or meteorite on the earth can cause the immediate extinction of dinosaurs? I think it is impossible. Let's talk about the changes in the weather. If the submarine volcano is really unstable, it will not soon kill all the dinosaurs in a few or decades. What's more, dinosaurs also exist and survive in the sea water.

I think the most credible statement is not any, but the synthesis of all theories. I believe it can be explained. For example, what can be confirmed is that, at the end of the Chinese era, there was indeed a great destructive area of popular rain, and there was any evidence that there was a large-scale submarine volcanic eruption in the Chinese era (maybe some ).

If I have read the above assumptions, I will support"The latest report of the Geological Society of America", But not fully supported.

Based on the above information, I assume that all types of dinosaurs are still living leisurely as they used to. When unknown falling objects appear on the day, some dinosaurs on the earth are busy escaping, some still don't know. Some eggs are still being incubated, some are still biting each other, and some are still waiting for food ......

With a loud bang, the waves, sound waves, electromagnetic waves, and other types of radiation came along, followed by a strong earthquake and endless countless pieces of meteorite. And some of these countless pieces of meteorite fall into the ocean and some land, will produce a certain degree of earthquake and impact. Not a very stable volcano was "excited" after the impact, and the sky began to be dark clouds, thunderplus, debris flows, landslides and so on.

Some of them are killed when they are waiting for food, some are buried by debris flows when they are biting, some may be split by various types of shock waves, and some may be shot by relentless radiation.

This disaster may have killed about 2/3 of dinosaurs. Because the number of meat-eating dinosaurs was small, the vast majority of the dead 2/3 of the dinosaurs were herbios.

Among the surviving 1/3 of the dinosaurs, the number of caocators is greatly reduced, and the distributed communities are scattered. In addition to the bad weather, the climate is erratic, and the landform is changing due to the impact, the continental plates accelerated the movement. The original number of edible plants became less and less, and the number of prey-type dinosaurs declined. Therefore, this reduced the survival rate and the number of edible foods, finally, the surviving 1/3 herbishes gradually become extinct.

In fact, the bad weather does not have a great impact on the meat-eating dinosaurs, and the decrease in the number of populations and dispersion may also lead to a decline in the reproduction rate of the meat-eating dinosaurs, but the most critical factor is the decrease in the source of the meat-eating dinosaur's food, that is, the decline in the number of grass-eating dinosaurs, and the final time when the grass-eating dinosaur went extinct, the meat-eating dinosaur gradually went extinct.

The above is just my point. Let's take a look!