Q. 15

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

Answer :

The first cells on the earth managed to survive in an atmosphere that lacked O2 because they were anaerobes ,i.e. they did not require oxygen for respiration and instead survived by the breakdown of other inorganic compounds like H2S etc. They survived without the presence of oxygen.

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