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: when the season changes  the amount of hours will change. 
Question: What happens when the season changes?
the amount of hours changes.

Fact: Thyroxine increase the rate of metabolism in cells throughout the body. 
Question: What increases the rate of metabolism in cells throughout the body?
Thyroxine.

Fact: Humans have collected and grown fungi for food for thousands of years. 
Question: What have humans have collected and grown for food for thousands of years?

fungi.