Answer:
More energy is made with oxygen.
Step-by-step explanation:
Just like when cellular respiration happens, when they use respiration they use and make energy more efficiently rather than through fermentation which isn't as efficient but doesn't use oxygen.
Without oxygen, organisms can split glucose into just two molecules of pyruvate. This releases only enough energy to make two ATP molecules. With oxygen, organisms can break down glucose all the way to carbon dioxide. This releases enough energy to produce up to 38 ATP molecules.