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: Ink is used for hiding from predators by some animals that eat small crabs. 
Question: Some animals that eat small crabs also use this for hiding from predators:?
answer:
ink.


question:
Fact: many chemical messengers that control body functions are proteins. 
Question: What are many chemical messengers that control body functions?
answer:
proteins.


question:
Fact: Oxygen typifies life. 
Question: What typifies life?
answer:

Oxygen.