What Caused the Dinosaurs to go Extinct?

The extinction of dinosaurs refers to the mass extinction of the Late Cretaceous organisms that occurred in the Cretaceous about 65 million years ago. It is a diverse and dominant vertebrate in the Mesozoic, and has dominated the global terrestrial ecosystem for more than 160 million years.

Dinosaur extinction

(Mass extinction event)

In fact, humans find

Extinction of lizards and snakes disappears when dinosaurs die out

A new study in 2012 showed that a large number of lizards and snakes disappeared when the dinosaurs became extinct 65 million years ago when the Earth suffered an asteroid collision.

Scientists now believe that a supermassive asteroid hit the coast of Mexico, causing widespread extinction of species and causing 83% of reptiles on Earth to disappear. Larger species suffer more. Any species that was larger than 0.5 kg at the time could not escape the disaster.

Dr. Nicholas Longrich of Yale University in the United States said, "Usually people would think that the asteroid collision event mainly caused the extinction of dinosaurs. It was also widely extinct. "

Longrich pointed out that a large number of reptiles appeared at the end of dinosaur survival, including tiny lizards and 2 meters long. At the time, ancient pythons were enough to devour dinosaur eggs and even kill the cubs of many dinosaur species. In the late Cretaceous asteroid collision event, many ancient reptiles have disappeared one after another, but the surviving species eventually evolved into more than 1,000 species today.

Regardless of whether the above things really happened, the total extinction of dinosaurs will be a strange event. We obtained some precious dinosaur fossils to enable the research work of scientists. We hope that this mystery will be solved in the near future. At the same time, we should know that any kind of organism has to undergo the process of generation, development, prosperity, and destruction, just like everyone has to experience age , illness , and death . This is the law of nature, and it will not change because of that huge and powerful species. The dinosaurs became extinct, and then a new era appeared. More and more advanced creatures will make the earth a better place.

Summary of reasons

The cause of the extinction of dinosaurs has been a controversy in the scientific community. An international research team of dozens of experts published their findings on this matter, pointing out that 65 million years ago, an asteroid hit the earth on the coast of Mexico. Earthquakes and fire storms caused by the impact of the Earth, the key is to throw tens of billions of tons of material into the atmosphere, blocking the sun's rays, and causing many creatures to lose their living space, including dinosaurs.

The research also pointed out that the impact provided the environment and conditions for the evolution of many new species, including humans.

It is really a cycle to annihilate one life. Looking at the situation of the earth, is it another stage of rebirth?

About 60 million to 70 million years ago, a major event happened on the earth, that is, the "dominant" dinosaur of the biological world suddenly disappeared. The mystery of dinosaur extinction has been the focus of long-term research and debate among scientists. There are as many as 130 types of extinction theories that have been publicly proposed, such as

Dinosaur extinct eggs spawn leading to extinction

Members of the Zoological Society of London, together with Daryl Codron and Marcus Clauss of the University of Zurich, conducted a study to explore the underlying causes and ways of dinosaur extinction.

A dinosaur mother can weigh up to 4 tons, which is 2500 times heavier than a newly hatched dinosaur, while an elephant mother weighs only 22 times her infant. In other words, toddlers of mammals are already quite large. For dinosaurs, to grow larger dinosaurs, not only do they need larger and thicker eggshells, but also the eggshell structure is required to enable the embryo to breathe, and it is almost impossible to meet this requirement. Therefore, newly hatched dinosaurs It must be much smaller. In addition, newborn mammals live in the same habitat as their parents: mothers feed them with breast milk until they can survive more independently. Large dinosaurs are another case: they have to adapt to many different habitats in their lives, because their body changes are too great, from a few kilograms to even 30,000 kilograms.

Daryl Codron explained that the scientific community has reached a consensus that organisms of a specific size will occupy corresponding habitats, that is, dinosaurs will experience most of all ecological domains in their lives, while mammals only need to Go through a few of them. The results show that small and medium-sized dinosaurs have very few individual species because their habitat will be occupied by young individuals of large dinosaurs. This situation does not occur in mammals. Statistics on all genus species of dinosaurs (including their descendantsbirds) show that when individuals weigh between 2 and 60 kg, only a few species live with adult individuals. Marcus Clauss concluded through computer simulations. First, the lack of small and medium species is caused by competition among dinosaurs, but mammals do not have such a disparity. Second, due to the existence of large dinosaurs and the general competition of young dinosaurs, breastfeeding. Animals do not develop into large species; again, for small dinosaurs, due to competition from similar species and mammals, their pressure to survive is so great that they either move to the brink of extinction or to new habitats, the latter Guaranteed their survival, that is, evolved into birds to occupy the sky.

The dominance of dinosaurs on the earth continued for a total of 150 million years, and the mass extinction event at the Triassic / Chalk boundary has brought about a huge disaster for dinosaurs. At that time, all living creatures weighing about 10 to 25 kilograms were almost extinct. Many mammals were below this threshold, so they were able to escape the disaster and then scale up to march into the vacant ecological domain. The fate of dinosaurs was the opposite, so they embarked on a decline.

Reptiles lived on land and began the "reptile era." For the first time, the land was widely occupied by vertebrates. At that time, the earth's climate was warm, there were dense forests all over the place, reptiles had enough food, and they gradually prospered, with more and more species. Some have longer legs and are suitable for living on land. Others have completely lost their legs and look like snakes. Some have become flippers like fins, indicating that they are back again. In the water; there are wings that fly towards the sky ... They continue to differentiate into various types of reptiles, one of which has become today's turtles, and the other has evolved into mammals. There is a modern snake and lizard. But the most prominent and diverse category is divided into crocodiles, dinosaurs and birds.

Dinosaur Extinction

Dinosaur's muscle belongs to a kind of organic silica gel. The content of silicon in dinosaurs is higher than that of animal ancestors. The content of silicon in ancestors of animals is higher than that of animals. Dinosaurs are extremely dependent on silane. Dinosaurs feed on high-molecular organosilicon or silicon-structured animals and plants. Dinosaurs are gradually extinct as the food they depend on decreases.

Dinosaur extinct comet impact plus volcanic eruption

After continuous research, the scientists finally found the exact proof. 65 million years ago, a huge comet hit the ground. Volcanic eruption was caused by the point of the internal shock theory opposite the comet impact. Of course, these are not enough to make dinosaurs extinct. What really killed the dinosaurs was that this volcano carried a large number of anaerobic bacteria after the eruption. This anaerobic bacteria converts oxygen into a toxic chemical gas. After 100,000 years or more. The amount of oxygen in the air becomes extremely scarce. Small mammals can survive. But the huge dinosaurs lost their ability to survive. So in order to continue to reproduce, the body is constantly shrinking. Zoom out again. It gradually evolved into other species similar to birds. The reason insects are so small today. It s also because there is too little oxygen in the air, so they ca nt get enough oxygen to drive huge limbs.

dinosaur