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 Let's solve this problem gradually.

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Echinoderms lack a centralized nervous system. Echinoderms are represented by the starfish. Starfish lack a centralized nervous system. So the final answer is (G).
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