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What is an exoskeleton?

An exoskeleton can be described as an outer shell-like structure, commonly found on insects and arachnids. It’s basically a hard outside, with all of the soft, mushy stuff on the inside. It offers support and protection for the insects.

So how does that differ from humans?

We have the opposite of an exoskeleton, which is referred to as an endoskeleton. An endoskeleton is an inner structure. An endoskeleton has the hard inside, with all of the soft, mushy stuff on the outside. Mammals and reptiles have an endoskeleton.