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, also known as the Great Dying, is considered the most severe mass extinction event in the history of life on Earth. It occurred about 252 million years ago and resulted in the loss of 96% of all marine species and 70% of terrestrial species.

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