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

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A facultative anaerobe is an organism that can live in both oxygen and oxygen-less environments. It is different from an obligate aerobe or an obligate anaerobe, which require a specific environment to survive. A microaerophile can survive only in low oxygen environments, while an obligate aerobe requires oxygen and an obligate anaerobe can survive only in the absence of oxygen.

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