(D) Bath sponges,such as $Spongia$,belong to the phylum $Porifera$. Their body wall is supported by a skeleton composed of proteinaceous $Spongin$ fib

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(D) Bath sponges,such as $Spongia$,belong to the phylum $Porifera$. Their body wall is supported by a skeleton composed of proteinaceous $Spongin$ fibres. When the sponge is dried and the living cells are removed,only the tough,flexible $Spongin$ fibre network remains.