Which of the following kinds of molecules is thought to have been absent from the primitive reducing atmosphere?

Name: Which of the following kinds of molecules is thought to have been absent from the primitive reducing atmosphere?
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Question

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Oxygen is thought to have been absent from the primitive reducing atmosphere because it was likely first introduced into the Earth's atmosphere through photosynthesis by early life forms, which did not exist in the primitive atmosphere.

Which of the Following Kinds of Molecules Is Thought to Have