Scientists say the fossil improves the theory of how shark skeletons formed Sharks – The Press Stories

Researchers say that part of an armored fish that swam in the oceans 400 m years ago may turn the evolutionary history of skull sharks on its head.
Bone fish such as salmon and tuna, as well as almost all terrestrial vertebrates from birds to humans, have skeletal skeletons. However, the skeletons of sharks are made from a soft material called cartilage – even in adults.
Researchers have long explained that the last common ancestor of all jaw vertebrae is the inner skeleton of cartilage, and t…

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