Which of these can live either with oxygen or without it?
a. facultative anaerobes
b. obligate anaerobes
c. obligate aerobes
d. bacteriophages

A. facultative anaerobes

Facultative anaerobes, can grow without oxygen but if oxygen is present; then, it will use the oxygen.

Letter B. is harmed when oxygen is present.
Letter C. its life is dependent on the presence of oxygen
Letter D. a virus that is dependent on the lifespan of the bacteria it is attached to. If the bacteria can't survive in oxygen, bacteriophages will die too.

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