Researchers examined marine ecosystems before, during, and after the Great Dying Several mass extinctions have occurred throughout Earth's history, the most recent of which was the Permian-Triassic extinction event, also known as the "Great Dying," which occurred 252 million years ago.
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The Great Dying: Earth s largest-ever mass extinction is a warning for humanity cbsnews.com - get the latest breaking news, showbiz & celebrity photos, sport news & rumours, viral videos and top stories from cbsnews.com Daily Mail and Mail on Sunday newspapers.