Which of the following BEST explains why species with radial symmetry do not exh

Question

Which of the following BEST explains why species with radial symmetry do not exhibit cephalization?

A. They lack an anterior-posterior body axis along which to concentrate sensory structures

B. They do not have to sense and respond to stimuli from their external environment

C. They are limited to digesting their prey within a single gastric cavity

D. They cannot move through their environment in a single, chosen direction

The answer was NOT B. Please help. This is on a chapter about Acoelomorpha, Platyzoa and Mesozoa.

Explanation / Answer

ANSWER) A. They lack an anterior-posterior body axis along which to concentrate sensory structures

Radial symmetry is gainful to organisms which does not move because sensory receptors are evenly distributed around the body.

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