You are presented with the question "what do microbial fuel cells convert chemical energy into?" and the following answer choices: 
- rays or beams
 - transportation technology
 - Deoxyribonucleicacid
 - flow of electrons
 - hydrogen and oxygen
 - deoxyribonucleic acid
 - an engine
 - heating liquids

Now knowing that microbial fuel cells convert chemical energy into electrical energy and electrical energy refers to energy associated with the flow of electrons, choose the best answer.


 

    flow of electrons     