Phylum Mollusca has

Ctenidia only

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Mantle only

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Both ctenidia and mantle

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Pneumatophore

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Chitin

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Solution

The correct option is C Both ctenidia and mantle
A ctenidium is a respiratory organ or gill which is found in many molluscs. It exists in bivalves, cephalopods and many gastropods. The molluscs shell is secreted by a thin sheet of tissue, called as the mantle, which encloses the internal organs. So, the correct answer is option C.

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