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: chromosome duplication occurs when cell division produces gametes. 
Question: chromosome duplication occurs when cell division does what?
[EX A]: produces gametes.

[EX Q]: Fact: A thing arranged in clusters mostly contain instructions for a single protein. 
Question: How often does a thing arranged in clusters contain instructions for a single protein?
[EX A]: mostly.

[EX Q]: Fact: Humans have collected and grown fungi for food for thousands of years. 
Question: What have humans collected and grown as food for thousands of years?
[EX A]:
fungi.