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During the origin of life, which of the following was absent in the atmosphere?

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in Biology – Class 12 by (271k points)
During the origin of life, which of the following was absent in the atmosphere?

(a) Methane

(b) Oxygen

(c) Hydrogen

(d) Ammonia

The question was posed to me in an internship interview.

The question is from Evolution in portion Evolution of Biology – Class 12

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Correct answer is (b) Oxygen

To elaborate: Oxygen was absent because due to the presence of high temperature, active hydrogen atoms combined with all oxygen atoms present to form water. This left no free oxygen in the atmosphere.

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