What is the skeleton of sponge made up of in biology?
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An internal skeleton is called an endoskeleton. A sponge endoskeleton consists of short, sharp rods called spicules . Spicules are made of silica, calcium carbonate, or spongin, a tough protein.
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The body of these animal is supported by calcareous or siliceous spicules or proteinaceous spongin fibers
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