Classification of sponges is primary based on the

Body organisation

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Body plan

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Skeleton

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Canal system

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Solution

The correct option is C Skeleton
The phylum Porifera contains sponges. These are diploblastic. Sponges are divided into 4 classes, mainly according to the composition of their skeletons. Four classes are Calcarea, Hexactinellida, Demospongiae, and Sclerospongiae.
So, the correct answer is option C

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