They find the fossil of a shark that shared time with dinosaurs and helped to unravel a centuries-old mystery

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During the time that dinosaurs existed, in the Cretaceous era - which began 145 million years ago and ended 66 million years ago - a species of shark also navigated the waters of the oceans; today, its fossils helped to understand the evolutionary period of its relatives. In a recent discovery in Mexico, a group of experts from the Department of Paleontology of the University of Vienna, Austria, confirmed an old hypothesis about them that emerge…