Write a correct answer to the given question based on its associated fact. Make sure that your answer is contained in the associated fact. Don't be creative and introduce any new word that is not mentioned in the associated fact! Remember that the associated fact has been rearranged to form the question. So, the correct answer words must lie within the associated fact. The correct answer can be a word, phrase, or even a sentence.

Input: Consider Input: Fact: animals with calcite shells form large colonies in shallow tropical water. 
Question: Animals with _ form large colonies in shallow tropical water?

Output: calcite shells.


Input: Consider Input: Fact: Flowers form on the stoma. 
Question: Flowers form on the?

Output: stoma.


Input: Consider Input: Fact: enormous rooms are formed by carbonic acid in groundwater seeping through rock and dissolving limestone. 
Question: what are formed by carbonic acid in groundwater seeping through rock dissolving limestone?


Output: enormous rooms.