___________ is a mollusc that does not possess a shell.

Unio

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Octopus

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Pila

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Chiton

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Solution

The correct option is B Octopus
The shell of molluscs is typically a calcareous exoskeleton that encloses, supports and protects the soft parts of an animal in the phylum Mollusca. For example, Unio, Pila, Chiton, etc. possess shells. However, not all molluscs have shells. Some molluscs like octopus, squid, cuttlefish do not have an external shell.
Hence, option B is correct.

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