An organism which requires full oxygen tensions of 21% for growth is:

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An organism that requires full oxygen tensions of 21% for growth is considered aerobic, meaning it needs oxygen to survive and grow. Option B) microaerophilic refers to organisms that grow best under reduced levels of oxygen while option C) aerotolerant organisms can survive in oxygen-rich environments but do not utilize oxygen for growth. Option D) anaerobic organisms grow in the absence of oxygen while option E) facultative organisms can grow in both the presence or absence of oxygen.

An Organism Which Requires Full Oxygen Tensions of 21% for Growth