Which of the following are exclusively marine animals?
A
Cnidarians
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B
Echinoderms
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C
Molluscs
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D
Arthropods
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Solution
The correct option is B Echinoderms Echinoderms are exclusively marine animals due to the presence of the water vascular system and tube feet. The Cnidarians and Molluscs are present in both the freshwater and marine habitat. Arthropods inhabit a cast range of habitat including aquatic, terrestrial, arboreal etc.