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.

[EX Q]: Fact: Plants respond to green manures to disrupt plant disease. 
Question: Plants respond to what to disrupt plant disease?
[EX A]: green manures.

[EX Q]: Fact: Water can make soil from rocks. 
Question: What causes rocks to be worn into soil?
[EX A]: Water.

[EX Q]: Fact: Common micro-organisms can cause people to become ill. 
Question: Common micro-organisms can cause people to become what?
[EX A]:
ill.