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: snakes provide little care to their young. 
Question: what provides little care to their young?
[EX A]: snakes.

[EX Q]: Fact: living things all require energy conservation as a trait. 
Question: living things all require energy conservation as a what?
[EX A]: trait.

[EX Q]: Fact: hearing is used for sensing sound by humans. 
Question: what uses hearing to sense sound?
[EX A]:
humans.