Question

At the end of which geologic era did a large mass extinction take place that wiped out more than 90% of all marine life?

Answer 1

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Answer 2

"3. End-Permian event, ca 250 million years ago; the most severe event: approximately 90% of all marine species died out, and a large number of terrestrial species too."

Source: http://www.earthsurfaceprocesses.com/3c-E-MassExtn.html

Answer 3

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