Respiration requires O2 . How did the first cells on the Earth manage to survive in an atmosphere that lacked O2 ?

Answers (1)

According to the scientists, the category of the cells which were found on the Earth was anaerobes. These cells carried out anaerobic respiration and did not require a continuous supply of oxygen for this process. Also, under special situations, all organisms can respire in an anaerobic manner and partially oxidise the glucose. Owing to this ability, the cells may have survived the atmosphere without oxygen.

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