Multiple choice

The largest extinction in Earth's history occurred at the end of which era?

  1. Paleozoic

  2. PreCambrian

  3. Cenozoic

  4. Mesozoic

Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

The Permian-Triassic extinction, occurring at the end of the Paleozoic era, is considered the largest mass extinction in Earth's history.