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According to scientists, Oparin and Haldane, which of the following gases were present in the primitive atmosphere?
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Correct Answer: A. CH4, NH3, H2, H2O
In the primitive atmosphere, no O2 was present as most organisms used chemosynthesis to create organic compounds. The Oparin and Haldane hypothesis states that methane (CH4), ammonia (NH3), hydrogen (H2), and water (H2O) were the only gases present. It was after the Miller and Urey experiment that it was proven that these gases and lightning could have given rise to simple organic compounds that then later evolved into more complex forms of life.
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