Science
Sharks almost disappeared 19 million years ago and scientists don’t know why – CNET
Something happened to ancient shark populations that caused their populations to decline dramatically… but what was it?
A previously unknown extinction event caused shark populations to collapse 19 million years ago.
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When Earth’s temperatures spiked and oxygen levels in the ocean plummeted some 252 million years ago, most life on the planet was doomed. Some estimates…
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