Speculate about the selective advantage of radial symmetry and a diffuse nerve net for sessile and free-floating animals such as sea anemones and jellyfish.

The sessile and free-floating species like sea anemones and jellyfish exhibits a selective advantage due to the existence of the features like radial symmetry and a diffuse nerve net as it helps in the greater dissemination of sensory compositions on the entire body and also homogenously exposes the organism to the environment present around it for enhanced sensory discernment. It helps the organism in approaching their environment equivalently from all the sides.