What do we mean by sessile how Radial Symmerty is advantageous 4nthem

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Solution

Sessile means which is not able to move , remain attached to one position with substratum.
Radial symmetry- Cnidarians are radially symmetrical means when any plane passing through the central axis of the body divides the organism into two identical halves. It is beneficial for them as they can extend their body parts in all directions from the central point.

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Sessile organisms that can gather food from all sides usually

A. Exhibit cephalisation

B. Exhibit radial symmetry

C. Have cellular level of organisation

D. Both A and B

Rotational symmetry and radial symmetry have same meanings.

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