How did Tyrannosaurus Rex evolve? Can humans last1.600 million years like the dinosaur era?

According to modern evolution theory, Tyrannosaurus Rex was also formed by other early dinosaurs in the long-term process of "natural selection, survival of the fittest". The offspring of creatures are basically the same as their parents, but there are some variations, such as having a bigger mouth or a longer tail than their father. Most of these mutations do not affect the survival of living things, so no one will pay attention to them. However, due to genetic problems, some characteristics obtained by mutation will continue to be passed on to the next generation, such as a bigger mouth or a longer tail. If this change is a good change and makes the organism better adapt to the environment, then this creature with variation characteristics will live better than other creatures without variation. If variation is not a good change, making it difficult for organisms to adapt to the environment, then organisms with this variation feature will become extinct.

One of the greatest characteristics of the dinosaur era was that the climate was warm and humid, and ferns were everywhere, so plant food was very easy to obtain. In this way, herbivorous dinosaurs can grow very big. Anyway, they can get enough food even if they can't walk, and their huge size makes them safer and they are not afraid of carnivorous dinosaurs. So carnivorous dinosaurs did not flourish in the early dinosaur era, and many carnivorous dinosaurs were no match for herbivorous dinosaurs at all. The so-called carnivorous dinosaurs ate more rotting corpses.

However, due to the change of the environment and the approach of the ice age, the weather became cold, a large number of ferns died, and food became difficult to obtain. It turned out that the super giant dinosaurs were terrible in the same place, but they were huge and inconvenient to move, so many of them gradually starved to death. Only when the size variation of dinosaurs becomes smaller can they survive and eat a piece for another place.

Herbivorous dinosaurs became smaller and more vulnerable to attack by carnivorous dinosaurs, so carnivorous dinosaurs began to flourish at this time. Carnivorous dinosaurs are generally smaller than herbivorous dinosaurs, such as raptors. They are flexible and agile, but they are at a great disadvantage when hunting. Therefore, they are just the opposite of herbivorous dinosaurs. In genetic variation, they became bigger and stronger for better predation, so large carnivorous dinosaurs appeared until the ultimate form-Tyrannosaurus Rex.

However, Tyrannosaurus rex was born at the wrong time. It appeared precisely because the ice age was coming, so it was destined to hang out only before the ice age. Glaciers came, cold-blooded animals died collectively, small reptiles such as turtles and crocodiles survived, while large reptiles such as Tyrannosaurus Rex became extinct without any suspense.

At this time, the predation advantage of "huge size" accumulated in evolution has become the chief culprit in the face of the environment, making them unable to live like small reptiles such as turtles.

As for the age of human beings, this is unpredictable. Archaeology can tell you the truth of history, and only God knows the future.