Which of the following is the chief reason the proto-cell was probably a fermenter?

Protocell did not have any enzymes

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Atmosphere did not have any oxygen

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Fermentation provides the most amount of energy

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There was not ATP yet

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Solution

The correct option is B Atmosphere did not have any oxygen
Since the environment lacked free oxygen and the mitochondria didn't arise till that time, the organisms were all fermenters.
So, the correct option is 'Atmosphere did not have any oxygen'.

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