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Question

A phylum including only marine animals is

A
Pisces
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B
Platyhelminthes
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C
Echinodermata
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D
Porifera
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Solution

The correct option is C Echinodermata
Echinodermata are free-living exclusively marine forms.
Pisces is seen in both aquatic and marine habitats. Platyhelminthes are free-living (aquatic or terrestrial) or parasitic (ecto- or endoparasites).
Poriferans are free-living aquatic, mostly marine, sedentary forms either solitary or colonial.
Therefore, the correct answer is option C.

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