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During origin of life, which among the following was not found in free form?

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in Biology – Class 12 by (271k points)
During origin of life, which among the following was not found in free form?

(a) Methane

(b) Ammonia

(c) Oxygen

(d) Hydrogen

This question was addressed to me in exam.

I would like to ask this question from Evolution in chapter Evolution of Biology – Class 12

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The correct option is (c) Oxygen

The best I can explain: Oxygen was not found in free form. It was produced mainly by blue green algae. U.V rays broke down water vapor present in molten mass to oxygen and hydrogen.

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