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The chemical composition of the gases surrounding the Earth has changed substantially over the past...

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Biology

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The chemical composition of the gases surrounding the Earth has changed substantially over the past 4 billion years One notable change was due to the emergence of photosynthetic organisms The process of photosynthesis increased the amount of what gas in the atmosphere 1 Oxygen O2 2 Hydrogen sulfide H SO4 3 Nitrogen N2 4 Water vapor H2O 5 Carbon dioxide CO2

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