Virtually all oxygen on Earth was and is produced by photosynthesis, which was invented by tiny organisms, the cyanobacteria, when our planet was still a rather uninhabitable place. Cyanobacteria evolved more than 2.4 billion years ago, but Earth only slowly transformed to the oxygen-rich planet we know today.
“We do not...
A Long Day For Microbes, And The Rise Of Oxygen On Earth
Eurasia Review
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A long day for microbes, and the rise of oxygen on Earth
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