The largest extinction, measured as a percentage of species that disappeared, occurred at the end of which geological period?

Question

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The Permian extinction, also known as the Great Dying, occurred approximately 252 million years ago and is estimated to have resulted in the loss of 90% of marine species and 70% of terrestrial species. This makes it the largest extinction event in terms of percentage of species lost.

The Largest Extinction, Measured as a Percentage of Species That