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: a flashlight requires a source of energy to produce light. 
Question: What requires a source of energy to produce light?
[EX A]: flashlights.

[EX Q]: Fact: Precipitation and runoff can create large bodies of inland water. 
Question: Precipitation and runoff can result in large bodies of what?
[EX A]: water.

[EX Q]: Fact: Movement happens when muscle fibers get shorter. 
Question: What do muscle fibers need to do to enable movement?
[EX A]:
shorten.