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.

Fact: An item's weight causes its gravitational force. 
Question: The weight of an item causes its what?
gravitational weight.

Fact: The genetic material responsible for heredity contains instructions for proteins. 
Question: The genetic material responsible for heredity contains what?
instructions for proteins.

Fact: Microbial fuel cells convert chemical energy into something that can be converted into kinetic energy and heat energy by a motor. 
Question: Microbial fuel cells convert chemical energy into what?

Something that can be converted to kinetic and heat energy by a motor.