Final answer:
Dr. Jones's experiment involves monitoring plant growth. Factors such as water, plant food, soil, sunshine, and soil type can impact plant growth. In an experiment, it is important to control all relevant variables.
Step-by-step explanation:
The experiment that Dr. Jones performed was monitoring plant growth. This could involve various factors such as the amount of water, plant food, soil, sunshine, and the type of soil. In Gary's experiment, for example, he tested the effect of the amount of water on plant growth. It is important to control all relevant variables in an experiment to ensure accurate results.