Scientists say 90% of the world’s open-ocean sharks died off in mystery extinction event 19 million years ago

Source: CNNThe recent discovery left researchers stunned, unable to explain the immense loss or the reason behind the deaths of one of the ocean’s most powerful predators.It began when scientist Elizabeth Sibert and her team were trying to learn more about the fish and shark abundance over the last 80 million years, according to a study released on June 3.“We stumbled into this thing completely by accident because what we saw was everything was pretty stable until about 20