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Sharks

Shark From Wikipedia, the free encyclopedia 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. Modern sharks are classified within the clade Selachimorpha (orSelachii), and are the sister group to the rays. However, the term “shark” has also been used for extinct members of the suborder Elasmobranchii outside the […]