Cephalization, the clustering of neurons and interneurons in the anterior part of the animal, is apparent in ________.
I.mammals
II.cnidarians
III.Planaria
IV.sea stars
A) I and II
B) III and IV
C) I and III
D) II and IV

Question

Quizplus · Accepted Answer

Cephalization is seen in organisms that have a distinct head with sensory structures, so it is most apparent in organisms with bilateral symmetry, such as mammals and planaria. Cnidarians and sea stars, on the other hand, have radial symmetry and do not have a distinct head region. Therefore, the best choice is C) I and III, as mammals and planaria both exhibit cephalization.

Cephalization, the Clustering of Neurons and Interneurons in the Anterior