Q: What do organisms cluster around in the ocean floor?\nOptions:\n- (A) kalenchoes\n- (B) ferns\n- (C) bacteria\n- (D) Chimneys\n- (E) an object\n- (F) alveoli\n- (G) graptolites\n- (H) allow growth
Let's think step by step below.

User
Organisms cluster around hydrothermal vents in the ocean floor. Chimneys top some hydrothermal vents. Organisms cluster around chimneys in the ocean floor.
Thus, the answer is (D).
Assistant