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Stella wants to test the hypothesis “If carbon dioxide levels increase, the growth rate of sunflowers will increase.” She places five young sunflower plants into similar containers and sets up pumps that release different amounts of carbon dioxide into each container. She plans to measure the daily height of the plants for two weeks and graph the data. Which additional considerations would produce the most reliable experimental results?

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cellularRespiration
She needs a control group of sunflowers that aren't their independent variable changed from normal
She should place one flower in a similar container, but not pump carbon dioxide into it. She should also give each plant the same amount of water.

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