The earliest sharks appeared over 420 million years ago. Popularized by the movie "Jaws" and by the show "Shark Week," the great white shark is probably the most well known and most fear shark. However, there are over 470 shark species.

About Sharks

Sharks are a group of fish characterized by a cartilaginous skeleton, five to seven gill slits on the sides of the head, and pectoral fins that are not fused to the head.

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