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


question:
Fact: Distilling water removes harmful substances before drinking. 
Question: Distilling water removes what before people drink it?
answer:
harmful substances.


question:
Fact: plants require electromagnetic energy to grow. 
Question: What do plants need to grow?
answer:

electromagnetic energy.