There is a very amazing phenomenon of biological evolution, such as modern biological classification is the genus of the genus Phytopoda, but do you know why it is so divided? It is because from the perspective of disciplines such as phylogenesis, organisms are classified by relying on similarity. Mammals are species that maintain body temperature, have mammary glands, and have fairly similar structures to their upper and lower jaws.
This is known biologically as radiation evolution, and mammals are similar because they all have a common ancestor. As early as more than 100 million years ago, the ancestors of mammals appeared, their body temperature was constant, but they adapted to a more diverse environment, but unfortunately they were born in the same era as dinosaurs, and the dinosaurs were stupid in size and knew that predators and reproduction, mammals were suppressed and difficult to develop. However, 65 million years ago, the Earth's climate suddenly changed, the dinosaurs suddenly disappeared, and mammals developed.
Radiation evolution means that the central species has some kind of survival advantage, such as the constant body temperature of mammals, general food, sufficient activity, mammals can adapt to a very cold environment, tropical, subtropical, temperate, cold zone have the distribution of mammals, as well as flying in the sky, running on the ground, swimming in the sea. In contrast, reptiles and amphibians are more distributed in the tropics, subtropics and temperate zones.
According to modern scientists, birds and dinosaurs have a common ancestor. There is a rumor on the Internet that chickens evolved from T-Rex. This view is flawed, first of all birds, especially the species of birds today, have arisen 130 million years ago, and the Maastricht period (MAA) that lived at the end of the Cretaceous period was about 68.5 million to 65 million years old at the end of the Cretaceous period, and was one of the last non-avian dinosaur species before the Cretaceous-Tertiary extinction event.
From this point of view, the rise of Tyrannosaurus rex populations is much later than that of birds, and evolution has a temporal relationship, that is, from a central species radiating to the surrounding evolution of multiple species. Birds, however, predate Tyrannosaurus rex, and their relationship is only to have a common ancestor, but due to the long period of evolution, the relationship between the two is actually very distant, just like the blood relationship between humans and any other mammal.
Dinosaur evolution history is a long time ago, about 230 million years ago when the terrestrial reptiles began to develop rapidly, when the ancestors of dinosaurs were only a few tens of centimeters tall or relatively small, in the long evolutionary history, due to the natural environment energy supply is sufficient, the dinosaur family food is sufficient so it multiplied a lot, so the dinosaur population rapidly multiplied, which in turn caused fierce intra-population survival competition, so the dinosaur population also has a very frequent radiation evolution phenomenon, the body size has also undergone a huge change.
The early land reptile action object type is also tens of centimeters larger, but before and after the Jurassic era, land reptiles have been unprecedented development, large reptiles are many, Mamenxi dragon, Argentinosaurus and other tens of tons, body length of tens of meters, Tyrannosaurus rex is also the early dinosaur long-term development of birth, the largest individual height of about 14 meters, is the most ferocious large land carnivorous reptile.
However, in China's Northeast Rehe biota, some bird species that survived about 130 million years ago have been found, such as species such as the diffuse bird, which have almost all the characteristics of modern birds, such as wishbones, teeth without teeth to form the upper and lower jaws, modern birds are modern bird species, there were some species similar to the anti-bird of this bird, they have a certain blood relationship with the present bird, but the blood relationship is also relatively far.
Modern scientists speculate that birds and Archaeopteryx, ornithischia and other dinosaurs have a relatively deep blood relationship, these dinosaurs have been somewhat like birds, they also have feathers, feathers, tail feathers and the like, because the small size is often arboreal survival, survival options gradually make some similar dinosaurs have the ability to glide, further development has become a species that can fly freely in the sky, bones, chest muscles and other physiological structures are also very adaptable to flight.
Species such as the ornithosaurus have a relatively close relationship with the ancestors of today's birds, in the era of Tyrannosaurus rex, birds have long become a widely distributed species, but also due to the suppression of dinosaurs, especially pterosaurs and other species, the development of birds in the age of dinosaurs is also more limited. After the extinction of the dinosaurs, birds also ushered in a good era of development, it is estimated that the species of birds reached an unprecedented tens of thousands of species, and later due to the survival competition between birds and environmental changes, only about 10,000 species of birds were left.
The relationship between chickens and Tyrannosaurus rex is like the relationship between humans and lemurs, very distant. Lemurs are also primates, but they have evolved more primitively than humans, and they are Old World monkeys, and their brains, especially the cerebral cortex, have not evolved as thoroughly as large apes, so their IQs are relatively low. Chickens and Tyrannosaurus rex have common ancestors, both of which originated as some kind of land reptile 230 million years ago, but when birds were born, T. rex did not appear, and the bird population was quite prosperous in the years when T. rex began to be active.
Moreover, chickens are not birds that existed at the beginning, but species that differentiated from bird populations long after the birth of birds, and after humans entered civilization, species such as proto chickens were greatly modified before modern chickens appeared. With tens of millions of years of isolation, the genetic differences in dinosaur birds have been very large, and 65 million years ago, the extinct Tyrannosaurus rex, the ancestors of modern chickens have survived, and have undergone tens of millions of years of evolution, and the genetic differences between modern birds and dinosaurs are very large.
However, some similar traits have also been retained, mainly focusing on the general skeletal structure, cloaca, oviparous and other biological characteristics. Chickens and Tyrannosaurus rex have a common ancestor, but from bird players to the emergence of T. rex to the rise of dinosaurs extinct birds, differentiated for tens of millions of years to more than 100 million years, saying that chickens are Tyrannosaurus rex evolved is basically a rumor.