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The correct answer among the choices listed is option B. Organisms that grow in the absence of free oxygen are known as anaerobic. Aerobic means presence of oxygen while anaerobic is the opposite. In terms of respiration, this type uses electron acceptors except oxygen.

Answer: The correct answer for the blank is-

B.anaerobic.

Explanation:

Anaerobic organisms are those organisms that do not require free oxygen for their growth and survival. In other words, these organisms can grow in the absence of free oxygen that is in the absence of oxygenated environment.

Example - Certain bacteria (such as from the genera Clostrodium, Fusobacterium, Actinomyces etc), some protozoan and some worms are Anaerobic organisms.

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