Eight million years ago, soft, boneless creatures first evolved into fish with internal skeletons. Fish then evolved into amphibians that walked on land, and then evolved into reptiles. One of these reptiles evolved into archosaurs.
The earliest dinosaurs were small, bipedal carnivores, but large, four-legged plant-eaters also evolved at the end of the Triassic. During the Jurassic and Cretaceous periods, dinosaurs diverged into a host of large and small carnivores, bulky plant-eaters, small, fast-moving plant-eaters, and others with large bony plates, horns, decks, and hammers for defense Groups of organs.
All dinosaurs are derived from the Archosaurs. The explanation for the upright walking of dinosaurs is that the earliest Archosaurs lived on the plateau and were small or medium-sized carnivores. They needed to be agile to catch prey. Running, therefore, archosaurs developed different postures, among which the dinosaurs gradually stood upright with their limbs.
In order to catch prey, speed is particularly important. The body is lifted up by the forelimbs so that the tail serves as a balancer to effectively achieve a standing posture. The entire body uses the belt as a hub and develops into a dinosaur with a special reptile form. It was completed around the early Triassic.
The era from 250 million years ago to 65 million years ago, the Age of Dinosaurs (the heyday of dinosaurs) Mesozoic Era: the second geological era of the Phanerozoic Era, refers to the era between the Paleozoic Era and the Cenozoic Era, 250 million years ago The era - 65 million years ago, is geologically divided into three periods (Triassic, Jurassic, and Cretaceous) called the Mesozoic Era. It was the era when reptiles dominated the earth at its peak.
Among them, the representative animals, dinosaurs, appeared in the late Triassic period, flourished in the Jurassic and mid-Cretaceous periods, and became extinct in the late Cretaceous period 65 million years ago. Because the most prosperous and representative species on the earth at that time were dinosaurs (which ruled the earth) It lasted about 160 million years), so the Mesozoic Era is also called the Age of Dinosaurs.
animal tags： dinosaur fish evolution archosaurs origin
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