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.

Fact: mammals prevent death with the help of a diaphragm. 
Question: What do mammals use a diaphragm for?
Preventing death.

Fact: Using hydropower reduces greenhouse gases. 
Question: What does hydropower help reduce?
Greenhouse gases.

Fact: A sifter is used for separating soil. 
Question: A sifter is used for doing what to soil?

separating.