Q: Where do corals form large colonies?
Options:
- (A) Mars
- (B) new World
- (C) Sediment
- (D) shoreline
- (E) environment
- (F) Absorb light
- (G) loose soil
- (H) polyps
Let's think step by step below.
Corals form large colonies in shallow tropical water. Water is shallow at the shore with gradual deepening. Corals form large colonies at the shoreline.
Thus, the answer is (D).