Corals form large colonies in shallow tropical water.
Coral reefs are found in the warm, clear, shallow waters of tropical oceans worldwide.
Corals form large colonies in the warm, clear shallow waters .
Where do coral colonies form?

A. ocean loor
B. south atlantic
C. warm, clear, shallow waters
D. exposure to the sun
E. arctic ocean
F. To conserve energy
G. sub-units of species
H. To another location like underground