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by sampo
2657 days ago
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> The great oxidation event It took 2 billion years for the hard-working unicellular cyanobacteria to produce enough oxygen to first oxidize the rocks and minerals on the Earth's surface, and to build up enough oxygen in the atmosphere for the birth of multicellular life to be possible. But if the planed had only supported one half of the cyanobacterial biomass it did, or if the amount of rocks to oxidize, or the mass of the atmosphere, was larger, that 2 billion years could have as well taken e.g. 4 billion years. And the Sun would have already become too hot, and multicellular life would never have evolved. https://en.wikipedia.org/wiki/Great_Oxygenation_Event |
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