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: many chemical messengers that control body functions are proteins. 
Question: What are many chemical messengers that control body functions?
answer:
proteins.


question:
Fact: If something is outside during the day then that thing will receive sun. 
Question: When does something receive sun?
answer:
during the day.


question:
Fact: chemical weathering causes iron in limestone to oxidize. 
Question: chemical weathering causes iron to oxidize in what?
answer:

limestone.