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(A) According to the Oparin-Haldane hypothesis,the early Earth's atmosphere was reducing and contained simple molecules like $CH_4, NH_3, H_2,$ and $H

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Heat,cosmic rays,and lightning

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(A) According to the Oparin-Haldane hypothesis,the early Earth's atmosphere was reducing and contained simple molecules like $CH_4, NH_3, H_2,$ and $H_2O$. Energy sources such as high-energy ultraviolet radiation (cosmic rays),volcanic heat,and electrical discharges (lightning) were essential to drive the chemical reactions that synthesized the first organic monomers from these inorganic precursors. Therefore,a combination of these energy sources was responsible for the abiotic synthesis of organic compounds.

What was the primary source of energy at the time of the origin of life on Earth?

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