Question

The largest mass extinction event in the history of the Earth occurred at the end of the _______ period.

Answer 1

It was the Paleozoic Era about 250 million years ago

Answer 2

The world's largest mass extinction was the Permian-Triassic event about 250 million years ago, which wiped out 95% of earth's species. It marked the end of the Paleozoic era …and the beginning of the Mesozoic.