What came BEFORE the oxygen?
Kam I know that you have no interest in what I post, but I thought that you may make an exception of this post which answers your question.
Life Before Oxygen
Three billion years ago single-celled underwater bacteria used sunlight to convert carbon dioxide and water into tiny oxygen bubbles. Soon plants were turning an atmosphere full of volcanic carbon dioxide into oxygen.
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What came BEFORE the oxygen?Kam I know that you have no interest...
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