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: Without hair, 90 percent of the body's heat would be lost. 
Question: What can prevent 90 percent of the body's heat loss?
[EX A]: hair.

[EX Q]: Fact: Viruses are viewed by illuminating electrons. 
Question: What of the following can only be viewed by illuminating electrons?
[EX A]: viruses.

[EX Q]: Fact: a beak is used for catching worms by birds. 
Question: what do birds use a beak to catch?
[EX A]:
worms.