Exoskeleton

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An exoskeleton is the rigid, external covering for the body of some invertebrate animals that provides support and protection. Exoskeletons provide a protective water barrier and allows an animal to not dry out in the sun. When an animal grows in an exoskeleton it must shed the old one in a process known as molting. It is a key feature in arthropods, a category of animals including insects, spiders, cicadas, and crustaceans like grasshoppers, cockroaches,bees, snails, etc. 

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