Question Detail
Question
Which two animal phyla are explicitly mentioned as lacking cephalization?
Correct Answer
Option C is the correct answer.
Detailed Explanation
The 'Key Anatomical Features Across Animal Phyla' table, under 'Cephalization', notes: 'Well-developed in flatworms, arthropods, vertebrates; absent in sponges and cnidarians.'
Hint
Consider the simplest animal forms, which often lack a distinct head region.