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: animals use sound to find a mate. 
Question: What do animals use to find a mate?
answer:
sound.


question:
Fact: Macroevolution is evolution over geologic time above the level of interbreeding populations. 
Question: Macroevolution is evolution over what time scale above the level of interbreeding populations?
answer:
geologic.


question:
Fact: microorganisms cause food poisoning. 
Question: What causes food poisoning?
answer:

microorganisms.