Dinosaurs are a type of creature that has lived on Earth for more than 160 million years, and their evolutionary history is very complex and long. They appeared in the late Triassic period and experienced a large-scale evolutionary process until they became extinct at the end of the Cretaceous period.
During the evolution of dinosaurs, they experienced many important evolutionary events. The earliest dinosaurs were similar in form to lizards, with relatively simple muscle structures and small bodies. Later, some new evolutionary branches were differentiated, such as theropod dinosaurs and ornithischian dinosaurs.
Among them, theropod dinosaurs are one of the most successful evolutionary branches of dinosaurs, and their representative species include Tyrannosaurus, Velociraptor and Archaeopteryx. They are one of the largest, fastest and most powerful species in the dinosaur kingdom.
Ornithischian dinosaurs developed long necks, long tails and limbs facing downward during the evolution process, which made them representatives of giant herbivores, such as Brontosaurus and Diplodocus.
In general, dinosaurs experienced many important evolutionary events in their long evolutionary history, which also provided them with various advantages for survival and reproduction on Earth.
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