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Dec 6, 2018, 2:53 pm216 pts
Grist
The “Great Dying” was just as bad as it sounds. In the planet’s worst mass extinction 252 million years ago, up to 80 percent of all species died out, including up to 96 percent of ocean species. Trilobites, sea scorpions, and spiny sharks disappeared forever. The rapid reorganization of life on Earth…
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