How would the cycling of matter be different in anaerobic conditions than under aerobic conditions? (Hint: think about which atoms and molecules are reactants and products in each process.)
In anaerobic conditions, the cycling of matter is limited to the breakdown of organic molecules into simpler molecules such as carbon dioxide, methane, and hydrogen sulfide. These molecules are produced by the breakdown of organic molecules in the absence of oxygen. In contrast, under aerobic conditions, the cycling of matter involves the breakdown of organic molecules into simpler molecules such as carbon dioxide and water, which are produced by the breakdown of organic molecules in the presence of oxygen. In addition, aerobic conditions allow for the production of energy in the form of ATP (adenosine triphosphate) through the process of cellular respiration.
