1. Occurring in the presence of oxygen aerobic 2. The stage of respiration that occurs in anaerobic condition In animal cells anaerobic 3. The first step in the chemical breakdown of glucose alcohol f

1. Occurring in the presence of oxygen aerobic 2. The stage of respiration that occurs in anaerobic condition In animal cells anaerobic 3. The first step in the chemical breakdown of glucose alcohol fermentation 4. Occurring in the absence of oxygen glycolysis 5. The stage of respiration that occurs in anaerobic conditions In less complex organisms lactic acid fermentation