instruction:
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.
question:
Fact: Mammals can generate little bursts of energy by shivering. 
Question: What can a mammal produce by shivering?
answer:
energy.


question:
Fact: Playing is just one of many ways that humans and other animals learn how to behave. 
Question: What uses playing as just one of many ways to learn how to behave?
answer:
Humans.


question:
Fact: courtship can result in offspring. 
Question: What can result in offspring?
answer:

courtship.