Which of the following is exclusively a marine animal?

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

Echinoderms are exclusively free-living and marine animals. Porifera consist of sponges which are aquatic. Most sponges are marine but few are freshwater forms. Molluscs are marine as well as terrestrial forms. Pisces are found in both marine and freshwater.

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