Freshwater sponges are also grouped in the cl | vedclass

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(C) The phylum $Porifera$ is divided into three classes: $Calcarea$,$Hexactinellida$,and $Demospongia$. Sponges belonging to the class $Demospongia$ p

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Demospongia

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(C) The phylum $Porifera$ is divided into three classes: $Calcarea$,$Hexactinellida$,and $Demospongia$. Sponges belonging to the class $Demospongia$ possess a skeleton made of spongin fibers or siliceous spicules. Most members of this class are marine,but it is the only class of sponges that includes freshwater species,such as $Spongilla$.

Freshwater sponges are also grouped in the class:

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