True brains and spinal cords occur in
A) chordates.
B) mollusca.
C) crustacean.
D) hemichordates.

Question

Quizplus · Accepted Answer

True brains and spinal cords occur only in chordates. Chordates are characterized by the presence of a notochord, dorsal nerve cord, pharyngeal slits, and a post-anal tail, which gives rise to their unique neural anatomy. Mollusca, crustaceans, and hemichordates do not possess a true brain and spinal cord system like chordates.

True Brains and Spinal Cords Occur in