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Many years ago the oxygen was not in the air, it was in the water, single cells organisms made their own energy.
But now it was a problem : the cyanobacteria now there was a problem I was producing a lot of oxygen and that was toxic to some animals and that caused....
There was causing deaths!!! because all organisms were not accustomed to have all that oxygen.
This scientist called "The oxygen catastrophe" but it was something that could save the planet it was called: aerobic organisms
The single cells organisms made something named photosynthesis this could save the world because it controlled the oxygen level to be the one that organisms needed
and that is the world exists and so do we
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