Fossils representing most of the living groups of animals (e.g.,fish,insects,mammals)derive from the Precambrian eon.

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Fossils from most of the living groups of animals do not derive from the Precambrian eon. The Precambrian eon is known for simpler life forms such as bacteria and algae. Fossils representing most of the living animal groups can be found in the Paleozoic, Mesozoic, and Cenozoic eras.

Fossils Representing Most of the Living Groups of Animals (E