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Facultative anaerobes
Facultative anaerobes are versatile organisms that can adapt to both oxic (oxygen-rich) and anoxic (oxygen-free) environments.
Obligate aerobes
Obligate aerobes are organisms that depend on oxygen for aerobic respiration, a process that efficiently generates ATP (energy) by breaking down glucose.
Obligate Anaerobes
Obligate anaerobes find oxygen toxic. These organisms thrive in anoxic (oxygen-free) environments, such as deep ocean sediments, swamps, or the guts of animals.