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: Force being exerted on a soccer ball compresses it. 
Question: Force being exerted on a soccer ball does what?
[EX A]: compresses it.

[EX Q]: Fact: proteins contain genes. 
Question: what do proteins contain?
[EX A]: genes.

[EX Q]: Fact: Energy-saving is important when electrical energy is used to produce light. 
Question: Energy-saving is important when electrical energy is used to produce what?
[EX A]:
light.