An ocean evet some 19 million years ago nearly wiped out the entire shark population, a new study has found. What remains today is just a sliver of the diversity of the shark population that existed then.
source https://gadgets.ndtv.com/science/news/shark-population-diversity-ocean-event-19-million-years-ago-study-journal-science-yale-university-2456922#rss-gadgets-all
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