Which among the following is exclusively marine?

Porifera

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Echinodermata

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Mollusca

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Pisces

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Solution

The correct option is B Echinodermata
Echinodermata are all marine and have a water vascular system. Example- Starfish, Echinus, etc. Whereas some Porifera lives in saltwater such as Haliciona and some lives in freshwater such as Spongilla. Mollusca can survive on the rocky shore, freshwater saltwater, etc. Pisces can be freshwater or saltwater. Thus, the correct answer is option B.

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