The central nervous system is lacking in animals that have radial symmetry.
Radial symmetry is the morphological organization with the parts and regions of the animal arranged radially around a central oral-aboral axis.
Said division is made by an axis on which the planes of symmetry that define, in turn, the per-radial positions are determined.
- Compared to bilateral symmetry (which divides the body into a left half and a right half), radial symmetry is considered primitive.
- Bilateral symmetry favors cephalization and the development of a central nervous system.
- Animals with some type of radial symmetry usually have sensory receptors that are distributed evenly throughout the body periphery.
Therefore, we can conclude that the central nervous system is lacking in animals that have radial symmetry.
Learn more here: https://brainly.com/question/15708865
