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: protective plates over the ends of the fingers become more brittle with age. 
Question: What do fingers have over the ends that become more brittle with age?
answer:
protective plates.


question:
Fact: food contains organic molecules. 
Question: What does food contain?
answer:
Organic molecules.


question:
Fact: DNA is found to duplicate themselves. 
Question: What can DNA do?
answer:

duplicate itself.