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The data show the growth of two bean plants over several weeks using four different fertilizers. The experimental data would be more valid of which of the following variables was included in the experiment?
a. A fifth fertilizer was tested.
b. Only one plant was tested.
c. The plants were grown at variable temperatures.
d. A control without fertilizer was included for each plant.
(The data is in the image)
Answers: 1
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The data show the growth of two bean plan...
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