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 require plants to survive. 
Question: Animals require plants to what?
answer:
survive.


question:
Fact: Mammals took advantage of an asteroid impact. 
Question: What took advantage of an asteroid impact?
answer:
mammals.


question:
Fact: summer has short nights. 
Question: what are summer nights?
answer:

short.