Lynn Margulis - Oxygen Quotes

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Why does everybody agree that atmospheric oxygen... comes from life, but no one speaks about the other gases coming from life?

Lynn Margulis

The oxygen crisis that began only two billion years ago prompted the evolution of respiring bacteria. These microbes that used oxygen to derive biochemical energy more efficiently than ever before eventually took over most of the world. Some of the oxygen-breathing bacteria became symbiotic, merging with different (oxygen-eschewing) bacteria to form nucleated cells, which, after becoming sexual, evolved into fungi, plants, and animals.

Lynn Margulis