Biology

The correct answer is:

Color of pot.

In this experiment, the primary focus is on how sunlight affects plant growth, so the sunlight and growth are the variables being tested. The plants themselves are the subjects of the experiment.

The color of the pot is not a variable being tested in this experiment, assuming Jeremiah is controlling it (keeping it constant) for both plants. The color of the pot might have an indirect effect on plant growth (e.g., through heat absorption), but i...