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The organisms attached to the substratum, generally, possess

1. radial symmetry
2. one single opening of digestive canal
3. asymmetrical body
4. cilia on surface to create water current

Correct answer: radial symmetry

Solution

Organisms attached to a substratum are generally sessile, so they benefit from radial symmetry because it lets them respond to stimuli and capture food from all directions. This is common in forms like cnidarians and adult echinoderms.

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