Some of the best fossils of early animals from the Cambrian period come from the Chengjiang fossil site in China. They lived in a highly changeable environment that could have driven the evolution of greater diversity.
Some of the first complex animals lived in a shallow sea near the mouth of a river delta about 518 million years ago. The changeable environment, which was prone to violent floods, may have helped drive the evolution of early animals, including some of the first worms and animals with hard shells.
The Cambrian period, from 541 to 485 million years ago, saw a great flowering of animal life, dubbed theSubscribe for unlimited digital access
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