Which of the following normally occur whether or not oxygen is present? Naim 15:17 AP Biology Chapter 9 Which of the following normally occur whether or not oxygen is present? A. Glycolysis B. Fermentation C. Oxidation of pyruvate to acetyl CoA D. Citric acid cycle E. Oxidative phosphorylation Answer: A Learn More : Share this Share on FacebookTweet on TwitterPlus on Google+