Skeleton made up of spongin fibres occurs in

Calcarea

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Demospongiae

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Hexactinellida

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Both A and B

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Solution

The correct option is B Demospongiae
The Demospongiae are the largest class in the phylum Porifera. Their skeletons are made of spicules consisting of fibers of the protein spongin, the mineral silica or both. Many diverse orders in this class include all of the large sponges.
Hence the correct option is B.

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