Select the correct answer. The term facultative anaerobe refers to an organism that: A) uses oxygen or grows without oxygen. B) requires less oxygen than is present in air. C) prefers to grow without oxygen. D) is killed by oxygen.

The correct answer is A) uses oxygen or grows without oxygen.

A facultative anaerobe is an organism that can use oxygen for cellular respiration when it is available, but can also grow and produce energy anaerobically (without oxygen) if oxygen is absent. This flexibility allows facultative anaerobes to thrive in various environments.