Another discussion you could offer is: what happens when there isn't any CO^2? Or you can talk about what happens when a plant's roots are exposed to light (not air, but just light). [ Multiballer's advice column | Ask Multiballer A Question ]
alexandra61899 answered Saturday March 26 2011, 5:19 am: Plants take in carbon dioxide and sunlight as food and exhale oxygen. Similarly, humans and other animals take in this oxygen and exhale carbon dioxide. Plants and animals need each other to survive. [ alexandra61899's advice column | Ask alexandra61899 A Question ]
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