Which among the following groups of animals have only molluscs?

Starfish, sea urchin, sea lily

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Snail, devil fish, oysters

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Crab, insects and spiders

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Jellyfish, corals, sea pen

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Solution

The correct option is B Snail, devil fish, oysters
Among the given options snails, octopus (devil fish) and oysters belong to the phylum Mollusca. These animals have soft unsegmented bodies covered by a protective shell. Devil fish or octopus is an exception which lacks an outer protective shell.

Starfish, sea urchin, sea lily belong to the phylum Echinodermata.
Crab, insects and spiders belong to phylum Arthropoda.
Jellyfish, corals and sea pen belong to phylum Cnidaria.

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