The molluscan without a shell is

Sepia

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Octopus

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Loligo

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Nautilus

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Solution

The correct option is B Octopus
B. Octopus
EXPLANATION: Bivalves are that type of mollusks, which have two shells are clams and oysters. Univalves are those animals, which have only one shell, such as snail. Mollusks without any shell include banana slugs, octopus, etc.

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