C1 last min Revsion

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Evolution of the Atmosphere

There was a lot of CO2 and no oxygen
Oceans formed when water vapour condensed

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Green Plants

A lot of CO2 dissolved into the atmosphere
Green plants removed the CO2 and produced O2 by photosynthesise

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The Ozone layer

The build up of oxygen killed off early life forms
This allowed complex organisms to exist like humans

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