(B) The classification of sponges ($Phylum$ $Porifera$) is primarily based on the nature and composition of their endoskeleton,which consists of spicu

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(B) The classification of sponges ($Phylum$ $Porifera$) is primarily based on the nature and composition of their endoskeleton,which consists of spicules or spongin fibers. Therefore,the presence and type of spicules are the key criteria for their classification.