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How did chemisty and oceans produce this?
So, chlorophyll evolves to more complex forms so that it can capture and store enough UV energy to breaking the hydrogen-oxygen bond in water.
Now we have a mechanism to deliver Oxygen to the atmosphere via the aerobic photosynthesis of blue-green algae. But, the oxygen does not initially go into the earth's atmosphere:
So we have to do all of this before we have oxygen in the atmosphere as well as an ozone layer:
So now we can crawl out on the Land!
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