Which of the following modes of metabolism is most likely used for an individual that lives in an environment without oxygen, dies when exposed to oxygen, and uses fermentation?
a. Photoautotroph
b. Obligate anaerobe
c. Heterotroph
d. Facultative anaerobe
The correct answer should be B. obligate anaerobe. Anaerobe means that it can't live in aerobic conditions which means that if they are to survive then there shouldn't be any oxygen or air there at all. They are obligate which means that they would die if exposed to air, so this has to be the correct answer.
