A scientist wants to determine which fertilizer is more effective-Fertilizer X or Fertilizer Y. The best way for her to proceed would be to design an experiment with
A. two groups of plants-a group fertilized by Y and a control group with no fertilizer.
B. two groups of plants-a group fertilized by X and a control group with no fertilizer.
C. three groups of plants-a group fertilized by X, a group fertilized by both X and Y, and a control group with no fertilizer.
D. three groups of plants-a group fertilized by X, a group fertilized by Y, and a control group with no fertilizer.
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