Endoskeleton refers specifically to an internal bone structure, important in anatomy and biology studies. The frog's endoskeleton enables it to leap efficiently.
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Not Exoskeleton
Don't confuse endoskeleton with exoskeleton, which is an external shell supporting an organism. Unlike snails with an exoskeleton, humans have an endoskeleton.
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Associated With Growth
Endoskeleton is associated with the growth process of animals, including humans. A child's endoskeleton grows rapidly during the early years.