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The Epic Interactive Encyclopedia 1997
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endoskeleton
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1992-09-02
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11 lines
The internal supporting structure of
vertebrates, made up of cartilage or bone. It
provides support, and acts as a system of
levers to which muscles are attached to
provide movement. Certain parts of the
skeleton (the skull and ribs) give protection
to vital body organs. Sponges are supported
by a network of rigid, or semirigid, spiky
structures called spicules; a bath sponge is
the proteinaceous skeleton of a sponge.