An organism is discovered that thrives both in the presence and absence of oxygen in the air. Curiously, the consumption of sugar increases as oxygen is removed from the organism's environment, even though the organism does not gain much weight. This organism
A) is a facultative anaerobe.
B) is an anaerobic organism.
C) is a normal eukaryotic organism.
D) is photosynthetic.
E) must use a molecule other than oxygen to accept electrons from the electron transport chain.
Answer: A