Organisms that do not require oxygen for growth but grow better in its presence are called

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Facultative anaerobes are organisms that can grow with or without oxygen, but they grow better in its presence. These organisms can switch between aerobic and anaerobic metabolism depending on the availability of oxygen. Microaerophiles require oxygen, but at a low concentration, and aerotolerant organisms do not require oxygen for growth but can tolerate its presence. Anoxygenic organisms do not use oxygen for respiration, but they also do not necessarily grow better in its absence.

Organisms That Do Not Require Oxygen for Growth but Grow