Question

which kind of bacterium can get nutrients from its food with or without using oxygen?
facultative anaerobes
photosynthetic bacteria
obligate aerobes

Explanation:

Facultative anaerobes can grow with or without oxygen. They can use aerobic respiration when oxygen is present and switch to fermentation or anaerobic respiration in the absence of oxygen to obtain nutrients from food. Photosynthetic bacteria use light - energy for photosynthesis and obligate aerobes require oxygen for growth.

Answer:

facultative anaerobes