Calcareous shell is seen in

Oyster

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Snail

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Slug

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All of the above

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Solution

The correct option is B All of the above
Phylum molluscs are characterised by the soft, unsegmented body with a hard calcareous shell to protect the soft body e.g., oyster, snail. slug etc. Calcareous shell is the hard exoskeleton which provides protection to the organisms.

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