The endoskeleton of Porifera is composed of:

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(C) The body of sponges (Phylum Porifera) is supported by an endoskeleton made up of spicules or spongin fibers.Spicules are composed of either silica

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Spongin fibers

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(C) The body of sponges (Phylum Porifera) is supported by an endoskeleton made up of spicules or spongin fibers.Spicules are composed of either silica or calcium carbonate.Spongin fibers are proteinaceous fibers found in the mesohyl of many sponges.Therefore,spongin fibers are a characteristic component of the endoskeleton in many members of this phylum.

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