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: The direction the earth is tilted while it orbits the sun is what causes climate to change. 
Question: What determines the climate to change?
[EX A]: The way the earth is tilted.

[EX Q]: Fact: animals use glucose for energy. 
Question: what do animals use for energy?
[EX A]: glucose.

[EX Q]: Fact: evaporation can remove salt from water. 
Question: What can separate salt from water?
[EX A]:
evaporation.