Oxygen Depletion in Ancient Oceans Caused Major Mass Extinction

ENN
Aug 30, 2019, 3:33 pm202 pts
Late in the prehistoric Silurian Period, around 420 million years ago, a devastating mass extinction event wiped 23 percent of all marine animals from the face of the planet. For years, scientists struggled to connect a mechanism to this mass extinction, one of the 10 most dramatic ever recorded in Earth’s…

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