Everyone imagines that if the Cretaceous world can continue, we may see that animals are still the hegemons on the earth, and mammals may be turbid and disappear. However, some disasters destroyed life on land and in the sea 60 million years ago, and wiped out all dinosaurs and many other reptiles. Most experts believe that this catastrophe was caused by the impact of outer space, but other factors Such as volcanic eruption may also accelerate the process of its occurrence. In any case, the Mesozoic era came to an end in such a complicated disaster, and the era of reptiles came to an end.
During the Cretaceous period, dinosaurs have spread throughout the world, and many types of fists have been born. Many animals and plants that have existed for the first time also appeared in this period, including new groups of mammals and insects, as well as a variety of birds.