Fact 1: Corals form large colonies in shallow tropical water.

Fact 2: Tropical fishes require warm water.

Given the two facts above, answer the question "Corals form large colonies in shallow and what waterways" with the following options: 
- porous
 - Thames
 - warm
 - deep
 - water
 - calm
 - open ocean
 - cold


 

   warm      