Which of the following molecules are believed to have been absent from the primitive reducing atmosphere? A)water vapor (H₂O) B)carbon dioxide (CO₂) C)hydrogen (H₂) D)oxygen (O₂) E)nitrogen (N₂)

Question

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Oxygen (O₂) is believed to have been absent from the primitive reducing atmosphere, as it was a reducing environment lacking free oxygen until photosynthetic organisms began producing it.

Which of the Following Molecules Are Believed to Have Been