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: the platypus reproduces by laying eggs. 
Question: what reproduces by laying eggs?
[A]: platypus.


[Q]: Fact: animals use sound to find a mate. 
Question: What do animals use to find a mate?
[A]: sound.


[Q]: Fact: A stove can be heated by a metabolic reaction. 
Question: What process can help heat up a stove?
[A]:
metabolic reaction.