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10 June, 15:34

What is a mass extinction? How many have occurred in the last 600 million years?

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  1. 10 June, 16:36
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    Starting about 360 million years ago, a drawn-out event eliminated about 70 percent of all marine species from Earth over a span of perhaps 20 million years. Pulses, each lasting 100,000 to 300,000 years, are noted within the larger late Devonian extinction
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