‘Surprising’ Fossil Discovery Could Rewrite Shark Evolution Story – EcoWatch

A recent fossil discovery could overturn the way scientists think about shark evolution.
Sharks are different from other large fish like salmon or tuna in that they have softer, non-bony skeletons made out of a material called cartilage. It was previously thought that sharks split off from a common ancestor with a cartilage skeleton, before the bony skeletons favored by other fish and all terrestrial vertebrates evolved. But now, researchers have uncovered a fossil that is a common ancestor of…

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