Planaria belongs to the phylum:

Nemathelminthes

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Platyhelminthes

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Arthropoda

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Mollusca

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Solution

The correct option is B Platyhelminthes
Platyhelminthes (from Greek: Platy, means 'flat' and Helminth means 'worm') are a phylum of relatively bilateral, unsegmented, soft-bodied invertebrates.
Planarians are of a group of widely distributed, mostly free-living flatworms of the class Turbellaria and phylum Platyhelminthes.
Planaria belong to the phylum Platyhelminthes because they are flat in shape and have bilateral symmetry.

So, the correct answer is 'Platyhelminthes'.

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