An organism that can exist in both oxygen and oxygen-free environments is a(n) ______.

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Facultative anaerobes are organisms that can live in both oxygen and oxygen-free environments. They have the ability to switch between aerobic respiration and anaerobic respiration depending on the availability of oxygen. Obligate aerobes require oxygen for survival, obligate anaerobes cannot survive in the presence of oxygen, microaerophiles require low oxygen concentrations, and aerobes can survive in the presence of oxygen but do not necessarily require it.

An Organism That Can Exist in Both Oxygen and Oxygen-Free