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.