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.

[Q]: Fact: Genetic traits are passed down to offspring through chromosomes. 
Question: How are genetic traits passed down to offspring?
[A]: Through chromosomes.


[Q]: Fact: Absorbing energy causes metal objects to expand. 
Question: Metal expands when it does what?
[A]: absorbs energy.


[Q]: Fact: An automobile engine works by summing kinetic energy and potential energy. 
Question: What works by summing kinetic energy and potential energy?
[A]:
an automobile engine.