The skeleton (from Greek σκελετός, skeletós "dried up") is the body part that forms the supporting structure of an organism. There are two different skeletal types: the exoskeleton, which is the stable outer shell of an organism, and the endoskeleton, which forms the support structure inside the body. There are also two other forms of skeleton referred to, the hydroskeleton and the cytoskeleton.

"For all our failings, despite our limitations and fallibilities, we humans are capable of greatness."
Carl Sagan
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