First slide

Classification of Animals

Question

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

Easy

A

Radial symmetry
B

Feather-like gills
C

Open circulatory system
D

Water vascular system

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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