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.

[EX Q]: Fact: molecules of deoxyribonucleic acid are encoded with instructions that tell cells what to do. 
Question: What molecules are are encoded with instructions that tell cells what to do?
[EX A]: deoxyribonucleic acid.

[EX Q]: Fact: Complex chemistry occurs in cells. 
Question: What occurs in cells?
[EX A]: complex chemistry.

[EX Q]: Fact: space exploration is not possible without navigation. 
Question: What is used for space exploration?
[EX A]:
navigation.