Q.

Which of the following characters is shared by sea hare and sea urchin?

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a

Radial symmetry

b

Feather-like gills

c

Open circulatory system

d

Water vascular system

answer is C.

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Detailed Solution

Sea hare (Mollusca) and sea urchin (Echinodermata) possess open circulatory system.Water vascular system is a feature of echinoderms.Feather-like gills are found in molluscs.Symmetry is radial in adult echinoderms and largely bilateral in molluscs.
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Which of the following characters is shared by sea hare and sea urchin?