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if the original atmosphere of earth lacked oxygen, The first organisms can have Carried on anaerobic...

if the original atmosphere of earth lacked oxygen, The first organisms can have

  1. Carried on anaerobic respiration

  2. Been eukaryotic

  3. Carried on aerobic respiration

  4. Produced ozone

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Answer #1

Ans : Carried an anaerobic respiration

* Anaerobic respiration does not require the presence of oxygen to take place.

* Prokaryotes being simplest, were the first organisms to appear & they can easily perform the anaerobic respiration.

* So, if intially there was no oxygen in the atmosphere, the organisms would have carried out anaerobic respiration & they would be prokaryotes.

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