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What does it mean for an organism to be anaerobic?

It is poisoned by oxygen.

It lives in salty environments.

It is poisoned by water.

It produces large amounts of oxygen.

An organism that is anaerobic is one that does not require oxygen for survival and can actually be harmed by exposure to oxygen. These organisms typically obtain their energy through processes that do not involve oxygen, such as fermentation or anaerobic respiration.