Find out the odd one.

Adamsia

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Astraea

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Physalia

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Pleurobrachia

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Solution

The correct option is D Pleurobrachia
Adamsia, Astraea and Physalia belong to the phylum Cnidaria (Coelenterata). Cnidarians are aquatic, mostly marine, solitary or colonial sessile or free swimming, radially symmetrical animals. These phyla are divided into three classes Hydrozoa, Scyphozoa, and Anthozoa. Pleurobrachia belongs to the phylum Ctenophora.
So the correct answer is 'Pleurobrachia'.

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