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: if a pine falls then sunlight becomes available to the surrounding plants. 
Question: what provides more sunlight to surrounding plants by falling?
[EX A]: pine.

[EX Q]: Fact: Flowers detect light and darkness. 
Question: What grows after detecting light?
[EX A]: Flowers.

[EX Q]: Fact: a greenhouse is used to protect bushes by keeping them warm. 
Question: What can a greenhouse protect by keeping warm?
[EX A]:
bushes.