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Life on earth first started with plants. First, the volcanos released carbon dioxide into the air, then the plants took the carbon dioxide and exhaled oxygen. All life on earth is required to have oxygen. An increase in carbon dioxide will collect heat and will therefore make it too hot to live on earth. Lots of plants reduce the carbon doixide levels. - Im Editing This , This Information Was Not Useful , And Didnt Answer My Question -- Kylee

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