Most organisms obtain energy from food by the process of cellular respiration. Which is the MOST LIKELY explanation for what pre
vents Earth from running out of oxygen? A. The overall reactions of photosynthesis and cellular respiration are the opposite of one another, therefore the products of one are the reactants of the other, creating a cycle. B. The energy—and thus oxygen—flows for cellular respiration and photosynthesis take place in the same direction, and therefore build upon one another. C. Cellular respiration is a process that deposits energy and oxygen, and photosynthesis withdraws energy and uses oxygen, therefore balancing each other. D. Oxygen readily accepts electrons, so cellular respiration uses a negligible amount of oxygen. E. Cellular respiration is balanced by fermentation, an alternative process of glucose metabolism which returns oxygen to the atmosphere.
