A skeleton made of spongin fibres occurs in | vedclass

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(B) The correct answer is $(b)$. Spongin fibres are a characteristic feature of the class $Demospongiae$. These fibres are composed of a collagenous p

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Demospongiae

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(B) The correct answer is $(b)$. Spongin fibres are a characteristic feature of the class $Demospongiae$. These fibres are composed of a collagenous protein and provide structural support to the sponge body. In many species,they act as a cementing material that binds siliceous spicules together,while in some species like $Spongia$ (bath sponge),the skeleton is composed entirely of a network of spongin fibres.

$A$ skeleton made of spongin fibres occurs in

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