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When an asteroid or comet slammed into Earth about 66 million years ago, most of our planet’s species were wiped out in a mass extinction—including entire groups such as the nonavian dinosaurs, marine reptiles such as mosasaurs, and their flying kin the pterosaurs. But not all ecosystems suffered equally, and the dramatic difference in survival rates between marine species and freshwater ones has been particularly puzzling. A new study weighs in on the long-standing riddle.
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