Cephalization,the clustering of neurons and interneurons in the anterior part of the animal,is apparent in
A)Hydra.
B)cnidarians.
C)Planaria.
D)sea stars.

Question

Quizplus · Accepted Answer

Cephalization is seen in Planaria as they have a definite head region where the majority of the neurons are clustered, helping in the organization of the nervous system and sensory processing. Hydra and cnidarians have a decentralized nervous system where the neurons are spread throughout the body while sea stars have a nerve ring with few ganglia throughout their body.

Cephalization,the Clustering of Neurons and Interneurons in the Anterior Part