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The earth's atmosphere contains a small amount of carbon dioxide because of the amount of plants and bacteria which photosynthesise. The atmosphere used to be mainly carbon dioxiide until bacteria first evolved. When the bacteria evolved it photosynthesised, producing oxygen and taking in carbon dioxide, make the composition of the atmosphere change. Furthermore, the carbon dioxide dissolves in oceans, is used to form sedimentary rocks and animals and shells are carbon based. Fossil fuels are also carbon based. All of this uses up the carbon dioxide, so there is only a small amount in the atmosphere.

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17y ago

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