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 volume of an object can be used to measure the mass of the object. 
Question: The volume of an object can be used to measure what?
[EX A]: the mass of the object.

[EX Q]: Fact: Mammals generate heat mainly by burning calories. 
Question: Mammals generate heat mainly by what?
[EX A]: burning calories.

[EX Q]: Fact: Wind and rain cause a river to become deeper and wider. 
Question: Wind and rain cause what to become deeper and wider?
[EX A]:
river.