Q: What lacks a centralized nervous system?\nOptions:\n- (A) starfish\n- (B) barnacles\n- (C) blowfish\n- (D) our planet\n- (E) humans\n- (F) Pesticides\n- (G) insects\n- (H) sharks
Let's think step by step below.

User
Echinoderms lack a centralized nervous system. Echinoderms are represented by the starfish. Starfish lack a centralized nervous system.
Thus, the answer is (A).
Assistant