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: Fungi can not absorb light energy. 
Question: What can fungi not do?

Answer: absorb light energy.


Question: Fact: space exploration is not possible without navigation. 
Question: What is used for space exploration?

Answer: navigation.


Question: Fact: Metals expand when they don't pass all of the heat through themselves to elsewhere. 
Question: What is the result of imperfect passing of heat through a metal, on that metal?

Answer:
expansion.