According to scientists at the beginning of which era animals became abundant

According to scientists at the beginning of which era animals became abundant

According to scientists at the beginning of which era animals became abundant?

Answer: Paleozoic Era.

The Paleozoic Era is the earliest of three geologic eras of the Phanerozoic Eon. It is the longest of the Phanerozoic eras, lasting from 541 to 251.902 million years ago, and is subdivided into six geologic periods: the Cambrian, Ordovician, Silurian, Devonian, Carboniferous, and Permian.