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B
Monoplacophora
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C
Scaphopoda
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D
Gastropoda
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Solution
The correct option is B Scaphopoda Tusk shells belong to the Class Scaphopoda, meaning “boat foot,” which refers to lobes near the animal's foot resembling a boat hull. Tusk shell, also called elephant's tusk, elephant's tooth, or tooth shell, any of several marine mollusks of the class Scaphopoda. There are four genera of tusk shells (Dentalium is typical and most common) and more than 350 species.