(C) $Spongilla$ is a freshwater sponge that belongs to the phylum $Porifera$. $Porifera$ are characterized by a cellular level of organization,the pre

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An animal of $Porifera$ phylum.

(C) $Spongilla$ is a freshwater sponge that belongs to the phylum $Porifera$. $Porifera$ are characterized by a cellular level of organization,the presence of a water transport or canal system,and the absence of $cnidoblasts$ (which are characteristic of $Cnidaria$). Therefore,$Spongilla$ is an animal of the phylum $Porifera$.