(CNN) About 19 million years ago, about 90% of the world’s open ocean sharks died out, and scientists don’t know why.

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Scientists say that 90% of sharks in the open ocean died from a mysterious extinction
Scientists say that 90% of sharks in the open ocean died from a mysterious extinction 19 million years ago
Scientists say 90% of the world’s open ocean sharks, & # 39; died of a mysterious extinction 19 million years ago – CNN

Ref: https://www.cnn.com