Which one of the following is the stage of cellular respiration for which oxygen is not essential:

Explanation

The stage of cellular respiration for which oxygen is not essential is glycolysis. Glycolysis is the first step in cellular respiration and takes place in the cytoplasm of the cell. It does not require oxygen and can occur under both aerobic (with oxygen) and anaerobic (without oxygen) conditions. In the absence of oxygen, glycolysis is followed by either fermentation (in anaerobic conditions) or the continuation of the aerobic respiration process (if oxygen is available).