Question

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

Answer 1

Cephalization is the concentration of elements of the nervous system, especially those involved in sensory activities and coordination of responses, into an anterior head.Sessile (nonmoving) animals are less cephalized.
But they have cephalization system

Radially symmetric animals tend to be sessile (non-moving), free-floating, or very slow movers.

Option D is correct