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https://d1py7umku9kunm.cloudfront.net/assets/2883699/mudwatt.pngThe diagram shows a simple microbial fuel cell (Mudwatt by KeegoTech). Soil bacteria in the anoxic zone grow on the surface of the anode, by metabolizing organic molecules in the soil. They carry on anaerobic respiration, and use the anode as the terminal electron acceptor. These electrons are then conducted by a wire to the cathode at the surface of the soil, where the electrons combine with oxygen gas to make water. What is the ultimate source of electrons collected by the anode? A.organic molecules B. water molecules C.oxygen (O2) D.carbon dioxide

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