Mystery Event Decimated 90 Per Cent of Shark Diversity 19 Million Years Ago, New Study Finds

https://ift.tt/eA8V8J 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. Gadgets 360 https://ift.tt/2yDpjSA