A) have one opening of alimentary canal
B) have colliery mode of feeding
C) are attached to the substratum
D) live in water
Correct Answer: C
Solution :
Radial symmetry is usually exhibited in animals which are attached to the substratum. In this, the body of the individual can be divided into equal halves by any plane passing through centre from top to bottom, eg, sponges, coelenterates, echinoderms etc.
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