A body of water rich in electron donors available to participate in redox reactions Frequency and magnitude of wetland inundation A means of producing energy that can only take place in the absence of oxygen (e.g. nitrogen fixation, sulfate reduction, methanogenesis) 50-300 km wide circular currents that transport ocean water to depths of up to 1600 m A quantity that relates the concentrations of products to reactants of a reaction Microbes that can survive in both environments with and without oxygen
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