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How did the evolution of plants change the earth's atmosphere?

Answer:
Plants take in Carbon dioxide for Photosynthesis. Thus, when the earths atmorphere was rich in Carbon Dioxide, the plants evolution caused the CO2 levels to fall and the oxygen levels to rise. (Apologies. To be correct, the 2 should be just below the O, but unfortunately, I don't know how)
This made it possible for oxygen breathing animals to take to the land. (Mostly in the form of early amphibians)
First answer by Spil. Last edit by Spil. Contributor trust: 33 [recommend contributor recommended]. Question popularity: 0 [recommend question].

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