Ascientist grows tomatoes in greenhouses that differ only in the amount of carbon dioxide in the air. he determines the weight of tomatoes produced by plants in each greenhouse, and compares them to each other and to tomatoes grown in air with a natural, unaltered amount of carbon dioxide. is this a controlled experiment? why or why not?
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Ascientist grows tomatoes in greenhouses that differ only in the amount of carbon dioxide in the air...
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