Which of the following kinds of molecules is thought to have been absent from the primitive reducing atmosphere? A)water vapor (H₂O) B)methane (CH₄) C)hydrogen (H₂) D)oxygen (O₂) E)nitrogen (N₂)

Question

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It is believed that oxygen was absent from the primitive reducing atmosphere because oxygen is a highly reactive element that would quickly react with reducing agents present in the atmosphere, such as methane, to form more stable compounds.

Which of the Following Kinds of Molecules Is Thought to Have