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: An animal requires oxygen for survival. 
Question: What does an animal need for survival?
[EX A]: Oxygen.

[EX Q]: Fact: The bonds of that which when heavy is Deuterium cause water to expand when it freezes. 
Question: The bonds of that which when heavy is Deuterium cause what to expand when it freezes?
[EX A]: water.

[EX Q]: Fact: A plant requires nutrients to grow. 
Question: What does a plant require in order to grow?
[EX A]:
nutrients.