Oxygen, essential to our existence, took nearly a billion years to appear in significant quantities on Earth, despite the presence of microorganisms capable of producing it. This delay in our planet's ...
Holland, H. D., in The Origin and Evolution of Atmospheres and Oceans (edit. by Brancazio, P. J., and Cameron, A. G. W.), 86 (John Wiley and Sons, New York, 1964).
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