The greatest mass extinction pulse was the Permian-Triassic extinction event, and it happened about 250 million years ago, nearly wiping out life on Earth. It was Earth’s most severe extinction even, with 96% of all marine species and 70% of all terrestrial vertebrate species becoming extinct. It is the only known mass extinction that affected … Continue reading Earth Recovered 10 Million Years After Permian-Triassic Mass Extinction