Question: Starfish, sea urchins and sea cucumbers lack a what?\nOptions:\n- (A) characteristics\n- (B) the body's largest organ\n- (C) watery habitat\n- (D) centralized nervous system\n- (E) functioning arm\n- (F) underwater life\n- (G) biological diversity\n- (H) epidermis and dermis
Let's be accurate as possible and think step-by-step.
User
Echinoderms lack a centralized nervous system. Echinoderms include starfish, sea urchins, and sea cucumbers. Starfish, sea urchins and sea cucumbers lack a centralized nervous system.
The answer: (D).
Assistant