You are presented with the question "what forms large colonies in shallow tropical water?" and the following answer choices: 
- Most plants
 - passenger pigeons
 - orchids
 - honeybees
 - calcite shells
 - trout
 - sharks
 - humans

Now knowing that corals form large colonies in shallow tropical water and coral is the calcite shell of the coral animal, choose the best answer.


 

     calcite shells    