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Poison ivy is a weed that produces an oil which causes skin rashes. Scientists want to perform an experiment to see if poison ivy grows taller when exposed to more carbon dioxide. How should the control group in this experiment be treated?
A. The control group should have plants growing at higher oxygen levels.
B. The control group should have plants growing at different carbon dioxide levels.
C. The control group should have plants growing in different amounts of water.
D. The control group should have plants growing at normal carbon dioxide level.
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Poison ivy is a weed that produces an oil which causes skin rashes. Scientists want to perform an ex...
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