Shell is internal in

Monoplacophora

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Gastropoda

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Pelecypoda

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Cephalopoda

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Solution

The correct option is D Cephalopoda
Class Cephalopoda belongs to phylum Mollusca. They have internal shells with chambers connected by siphuncle. Other classes have either external shell or shell is absent. Other characteristics of Cephalopoda include large brain, flexible tentacles. Examples include cuttlefish and squids.
Thus, the correct answer is option D.

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