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

Fact 2: Coral reefs are found in the warm, clear, shallow waters of tropical oceans worldwide.

Given the two facts above, answer the question "Where do coral colonies form?" with the following options: 
- ocean loor
 - south atlantic
 - warm, clear, shallow waters
 - exposure to the sun
 - arctic ocean
 - To conserve energy
 - sub-units of species
 - To another location like underground


 

   warm, clear, shallow waters      