Organisms, attached to substratum generally possess

Radial symmetry

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Asymmetrical body

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Single opening of digestive canal

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Cilia to create water current

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Solution

The correct option is A Radial symmetry
Radial symmetry is a basic body plan in which the organism can be divided into similar halves by passing a plane at any angle along a central axis, characteristic of sessile and bottom-dwelling animals, as the sea anemone and starfish.
Therefore, the correct answer is option A.

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