Respuesta :
C because we are testing the effectiveness of Fertilizer X and Y and using no fertilizer can help determine if that would be better than using a fertilizer. Additionally, a control group of no fertilizer would be the third plant as that is considered normal for the experiment. Msg me for any more questions
C. three groups of plants—a group fertilized by X, a group fertilized by Y, and a control group with no fertilizer.
The scientist should design an experiment with three groups of plants—a group fertilized by X, a group fertilized by Y, and a control group with no fertilizer. All three groups should receive the exact same treatment in the experiment, except for how they are fertilized. This will allow the scientist to study the effects of the different fertilizers on the plants.