When did the most severe mass extinction on Earth occur?

Name: When did the most severe mass extinction on Earth occur?
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The most severe mass extinction on Earth occurred at the end of the Permian period, known as the Permian–Triassic extinction event. This event resulted in the loss of an estimated 90% of marine species and 70% of terrestrial species. It is also known as the "Great Dying" because of the severity of the extinction.

When Did the Most Severe Mass Extinction on Earth Occur