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 vehicle in use requires navigation. 
Question: A vehicle in use requires?
[EX A]: navigation.

[EX Q]: Fact: being exposed to wind can damage water supplies. 
Question: What can being exposed to wind do?
[EX A]: Damage water supplies.

[EX Q]: Fact: Ejaculation occurs when muscle contractions propel male gametes from the epididymes. 
Question: What is it called when male gametes are propelled because of muscle contractions?
[EX A]:
ejaculation.