Sharks are classified as a group of fish which have a cartilaginous skeleton, five to seven gill slits on the sides of the head, and pectoral fins which are not fused to the head. The earliest known sharks date from more than 420 million years ago. 

Shark teeth are constantly replaced throughout life, with some sharks losing 30,000 or more teeth in their lifetime, which represents a rate of tooth replacement from once every 8 to 10 days to several months.

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