Multiple choice

What percent of species on Earth went extinct at the end of the Paleozoic era?

  1. 50%

  2. 70%

  3. 95%

  4. 99%

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

The Permian-Triassic extinction event was the most severe in Earth's history, resulting in the extinction of approximately 95% of marine species and 70% of terrestrial vertebrate species.