Most animals, like mammals, birds, and some fish, have an internal skeleton that support their bodies and organs and allow movement. Exoskeletons, on the other hand, are external structures that support and protect an animal's body. It is comprised of chitin and calcium carbonate and can be primarily found on arthropods, like the ants shown above. The ant's exoskeleton is fairly hard so that it can protect its internal organs. Mobility isn't much of a problem for organisms like the ant, despite the tough skeleton, because of its segmented body.
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