The greatest extinction event of all time occurred at the end of the:

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The greatest extinction event of all time is known as the Permian-Triassic extinction event and occurred at the end of the Permian period approximately 252 million years ago. It resulted in the loss of 96% of all marine species and 70% of all terrestrial vertebrate species. It is believed to have been caused by a combination of factors including volcanic activity, climate change, and an asteroid impact.

The Greatest Extinction Event of All Time Occurred at the End