Please answer the following question by reasoning step-by-step.
What kind of animal doesn't have a centralized nervous system?\nOptions:\n- (A) dog\n- (B) mammals\n- (C) cows\n- (D) bird\n- (E) human\n- (F) elephants\n- (G) starfish\n- (H) a fish

(G)
Echinoderms lack a centralized nervous system.

Echinoderms are represented by the starfish.

Starfish lack a centralized nervous system.

.

So, the final answer is (G)