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A file-like rasping organ called radula is present in the buccal cavity of

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sea walnut

brittle star

apple snail

king crab

answer is C.

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Detailed Solution

Apple snail (Mollusca) has a file-like rasping organ called radula in its oral cavity.

Sea walnut (Ctenophora), brittle star (Echinodermata) and king crab (Arthropoda) lack radula.

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