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: moving people across bodies of water can be done by flying through clouds. 
Question: moving people across bodies of water can be done by what?
[EX A]: flying through clouds.

[EX Q]: Fact: Using hydropower reduces greenhouse gases. 
Question: What does hydropower help reduce?
[EX A]: Greenhouse gases.

[EX Q]: Fact: a skateboard requires smooth surfaces. 
Question: What requires a smooth surface?
[EX A]:
skateboards.