TASK DEFINITION: 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.
PROBLEM: Fact: many chemical messengers that control body functions are proteins. 
Question: What are many chemical messengers that control body functions?

SOLUTION: proteins.

PROBLEM: Fact: waves can be used to produce electricity. 
Question: What can be used to produce electricity?

SOLUTION: waves.

PROBLEM: Fact: fog is formed by h2o vapor condensing in the air. 
Question: What kind of vapor condenses to form fog in the air?

SOLUTION:
h2o.