A shell is absent in:

Pila

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Unio

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Octopus

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Chiton

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Solution

The correct option is D Octopus
Octopus belongs to the phylum Mollusca.
Certain organisms of molluscs have a hardened shells surrounding their soft body. For example - Pila, Unio, and Chiton.
Octopuses do not have a shell.
Thus, the correct answer is option C.

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