An Underwater Revolution Millions of Years Ago Rewrote The Script of The Ocean
Look far enough back in time, and a pattern may emerge. After studying thousands of ancient fossils, paleontologist Jack Sepkoski identified just such a thing in 1981: an epic sequence of life and death, etched into the skeletons of the last 500 million years.
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https://www.sciencealert.com/an-underwater-revolution-millions-of-years-ago-rewrote-life-like-a-mass-extinction
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