If microbial fuel cells convert chemical energy into something that can be converted into kinetic energy and heat energy by a motor, then microbial fuel cells convert chemical energy into what?

Answer choices:
- Something with exactly eight protons
 - Something studied by Michael Faraday
 - scraping oneself on a contaminated object
 - Something that moves in an elliptical orbit
 - skin redness and pain, possible swelling, blisters, fever, headaches
 - remove toxic material from the stomach before it is absorbed
 - Something that can be converted to kinetic and heat energy by a motor
 - Something made of glass, fiberglass, polyethylene, or vinyl

 

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