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Radial symmetry is often exhibited by animals having

1. one opening of alimentary canal
2. aquatic mode of living
3. benthos/sedentary living
4. ciliary mode of feeding

Correct answer: benthos/sedentary living

Solution

Radial symmetry is common in animals that are sessile or sedentary because they can receive stimuli and food from any direction. This body plan is especially useful for benthic organisms living attached to a surface or on the sea floor.

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