Facultative anaerobes can utilize aerobic cellular respiration when oxygen is present and fermentation when oxygen is in low supply.

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Facultative anaerobes are capable of both aerobic respiration and fermentation, and will choose which process to use based on the level of oxygen present in their environment. If oxygen is present, they will use aerobic respiration. If oxygen is lacking, they will switch to fermentation.

Facultative Anaerobes Can Utilize Aerobic Cellular Respiration When Oxygen Is