Sponges are

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(A) Sponges belong to the Phylum $Porifera$ and are considered diploblastic animals.Their body wall consists of an outer layer called the $pinacoderm$

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Diploblastic

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(A) Sponges belong to the Phylum $Porifera$ and are considered diploblastic animals.Their body wall consists of an outer layer called the $pinacoderm$ (ectoderm) and an inner layer called the $choanoderm$ (endoderm).Between these two layers,there is a gelatinous,non-cellular matrix known as the $mesenchyme$ or $mesohyl$.

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