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Sharks belong to a family of fish that have skeletons made of cartilage, a tissue more flexible and lighter than bone. They breathe through a series of five to seven gill slits located on either side of their bodies. All sharks have multiple rows of teeth, and while they lose teeth on a regular basis, new teeth continue to grow in and replace those they lose.
Shark ‘skin’ is made up of a series of scales that act as an outer
skeleton for easy movement and for saving energy in the water. The upper
side of a shark is generally dark to blend in with the water from above
and their undersides are white or lighter colored to blend in with the
lighter surface of the sea from below. This helps to camouflage them
from predators.
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