Answer:
Cellular respiration
Explanation:
Fermentation is a mechanism in anaerobic respiration(breaking down glucose in the absence of oxygen). Examples are lactic acid fermentation is humans, Alcohol fermentation in yeast.
Cellular respiration sums up both anaerobic and aerobic(with oxygen)
Metabolism is just breaking down food molecules chemically into their simplest forms (monomers). These monomers then undergo cellular respiration to produce ATP
