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The Cambrian Period witnessed the most rapid and widespread diversification of life in Earth's history, known as the Cambrian explosion, in which most modern phyla first appeared. Fish, arthropods, amphibians, reptiles, and synapsids all evolved during the Paleozoic. Life began in the ocean but eventually transitioned onto land, and by the late Paleozoic, it was dominated by various forms of organisms.
This period started 248 million years ago and finished 213 million years. This period was the beginning of the Mesozoic era. Life in the Triassic Period Dinosaurs and other reptiles became the dominate land animals.Frogs appeared and later the first tortoises, turtles and crocodiles.The first mammals appeared.his period was the beginning of the Mesozoic era. Life in the Triassic Period Dinosaurs and other reptiles became the dominate land animals. Frogs appeared and later the first tortoises, turtles and crocodiles. The first mammals appeared.