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In most hypotheses of early Earth and the formation of life, it is accepted that the atmosphere was a reducing one. This means that there was an abundance of methane, ammonia, and water vapor, but there was an absence of significant amounts of oxygen gas. Based on this assumption, what was likely the first metabolic activity to harness ATP to evolve in primitive cells? A) Photosynthesis, as plants evolved before animals B) Cellular respiration, as this generates the most ATP C) Glycolysis, as this does not require organelles not oxygen D) Calvin cycle, as glucose was required by all cells for metabolism

Answer :

the answer is C because glycolysis doesn't use organelles that need oxygen

Answer:

The most appropriate answer would be option C.

The atmosphere of early earth was reducing in nature, that is, oxygen-free atmosphere.

This is the reason that scientists believed that the earliest prokaryotic cell evolved was heterotrophic in nature.

They use to obtain energy by fermenting organic molecules present in the sea broth.

Glycolysis is one of the processes which were involved in this fermentation as it does not require oxygen. It produces a net gain of two molecules of ATP (adenosine triphosphate).

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