Fact 1: Microbial fuel cells convert chemical energy into electrical energy.

Fact 2: Food is chemical energy.

Given the two facts above, answer the question "What converts food into electrical energy?" with the following options: 
- transportation technology
 - windmills
 - matter vibrating
 - solar panels
 - adding heat
 - one celled organisms
 - microbial fuel cells
 - dams


 

       microbial fuel cells  