Ancient fish forces rethink of how sharks evolved to be expert swimmers – Inverse

Cutting through the water with a grace and agility that makes them the apex predators of their ecosystems
, the seemingly effortless way sharks move is made possibly by one curious trait: They don’t have bones.
Instead, their skeletons are made of cartilage. Researchers have long believed that this boneless body schemata predated bony skeletons of other fish; indeed, sharks, they thought, were a blueprint for bones.
But a new fossil finding from western Mongolia challenges that understandin…

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