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Skeleton

In biology, the skeleton or skeletal system is the biological system providing physical support in living organisms.

Skeletal systems are commonly divided into three types - external (an exoskeleton), internal (an endoskeleton), and fluid based (a hydrostatic skeleton), although hydrostatic skeletal systems may be classified separately from the other two, since they lack hardened support structures.

Note:   The above text is excerpted from the Wikipedia article "Skeleton", which has been released under the GNU Free Documentation License.
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July 31, 2015

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