About 250 million years ago, at the end of the Permian period, something killed some 90 percent of the planet's species. Less than 5 percent of the animal species in the seas survived. On land ...
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Ancient Frogs Survived Earth's Greatest Mass Extinction Event by Not AdaptingLearn why the temnospondyls’ inability to evolve eventually did them in when mammals and dinosaurs appeared on the scene.
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