Fact 1: Corals form large colonies in shallow tropical water. Fact 2: Coral is the calcite shell of the coral animal. Given the two facts above, animals with _ form large colonies in shallow tropical water?

Select from the following.
a). calcite shells;
b). an organism's body;
c). Absorb light;
d). biological diversity;
e). Leptospirosis;
f). produce offspring;
g). allow growth;
h). to stay warm;
The answer is:
a).