Skeleton of the class Demospongiae may be composed of

Calcareous spicules

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Silicious spicules

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Spongin fibres

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Both spongin fibres and silicious spicules

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Solution

The correct option is C Both spongin fibres and silicious spicules
The Demospongiae are the largest class in the phylum Porifera. Their 'skeletons' are made up of spicules consisting of fibers of the protein spongin, the mineral silica or both (silicious spicules).
Therefore, the correct answer is option D.

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