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?
A) Carbon dioxide (CO2) .
B) Nitrogen (N2) .
C) Hydrogen sulfide (H2SO4) .
D) Oxygen (O2) .
E) Water vapor (H2O) .
Correct Answer:
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