You are presented with the question "What converts food into electrical energy?" and the following answer choices: 
- transportation technology
 - windmills
 - matter vibrating
 - solar panels
 - adding heat
 - one celled organisms
 - microbial fuel cells
 - dams

Now knowing that microbial fuel cells convert chemical energy into electrical energy and food is chemical energy, choose the best answer.


 

       microbial fuel cells  