How do starfish communicate with each other?\nOptions:\n- (A) huddle together\n- (B) writing\n- (C) during the day\n- (D) pheromones\n- (E) Chemical energy\n- (F) waving their arms\n- (G) Decibels\n- (H) talking Let's solve this problem gradually.

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Echinoderms use pheromones to communicate with each other. Echinoderms are represented by the starfish. Starfish use pheromones to communicate with each other. So the final answer is (D).
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