The most severe mass extinction occurred at the end of the Permian Period.

Name: The most severe mass extinction occurred at the end of the Permian Period.
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The end-Permian extinction, which occurred approximately 252 million years ago, is considered the most severe mass extinction event in Earth's history, with estimates of up to 96% of all marine species and 70% of terrestrial vertebrate species becoming extinct.

The Most Severe Mass Extinction Occurred at the End of the Permian