instruction:
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.
question:
Fact: Breathing provides one substance transported by the blood. 
Question: What process provides one substance transported by the blood?
answer:
breathing.


question:
Fact: Burning fuel in furnaces can kill. 
Question: Burning fuel in a furnace can?
answer:
kill.


question:
Fact: Trees have woody stems that insulate. 
Question: What do trees have that insulates?
answer:

woody stems.