Answer
A
Work Step by Step
Option B is incorrect. Segmentation is the repetition of body parts within separated portions of the body.
Option C is incorrect. Body symmetry refers to the division of the body along an imaginary axis or axes.
Option D is incorrect. Nerve nets are a diffuse network of nerves used to carry information to and from the parts of the body in invertebrates that have no centralized brain.
Option A is correct. Cephalization is the centralization of nerves at one area of an animal and are usually contained within a brain.
