Dinosaurs and sharks are both species on our planet. Dinosaurs died out 100 million years later, but sharks have existed for more than 500 million years. So far, sharks have not become extinct.

According to related research, sharks appeared on the earth about 500 million years ago, more than 200 million years earlier than dinosaurs. According to some related research by scientists, there have been five mass extinctions on the earth. However, despite five earth upheavals, sharks have survived, and they appear in almost all oceans, no matter whether they are far or near the sea, deep or shallow. Why is this?

In fact, it can be seen from the living area of sharks that their adaptability is very strong. In addition, sharks are large carnivores, which can eat many kinds of fish as food, and even kill each other and eat the same kind when they are extremely hungry. So in terms of food, even after five mass extinctions, sharks will not be threatened by food shortage. In addition, compared with the land environment, the marine environment is safer and there are not so many natural disasters. And all the oceans are almost connected, and sharks can swim anywhere.

Therefore, when an alien asteroid hits the earth, the earth's temperature drops sharply, volcanoes erupt, and plants and animals on land have almost nowhere to escape. When they can only meet death, sharks can swim to some tropical areas to find areas suitable for survival, so that they can tide over the difficulties. Some modern scientists have also studied sharks and found that sharks are actually very clever creatures. Several researchers from Bonn University in Germany tested the shark's recognition ability. They put 12 bamboo sharks in the training pool, and there are two sets of picture projections on the wall of the pool, in which the numbers are different from each other. The researchers found that almost all of these sharks were exposed to a large number of images, which showed that sharks had a certain ability to distinguish numbers.

So it seems that sharks can survive until now, first because of environmental reasons and second because of their strong adaptability. Because of the change of the earth's crust, dinosaurs could not adapt to the changed earth and gradually went extinct until extinction.