Where do corals form large colonies?\nOptions:\n- (A) Mars\n- (B) new World\n- (C) Sediment\n- (D) shoreline\n- (E) environment\n- (F) Absorb light\n- (G) loose soil\n- (H) polyps Let's solve this problem gradually.

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Corals form large colonies in shallow tropical water. Water is shallow at the shore with gradual deepening. Corals form large colonies at the shoreline. So the final answer is (D).
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