Biology

The correct answer is: Vary the number of lights on in each pot.

Explanation:

Zoe's experiment aims to test how the number of lights affects plant height. However, in her current setup, she has the same number of lights in each pot. To improve the experiment, she needs to vary the number of lights in each pot. By changing the number of lights (for example, 1 light, 2 lights, 3 lights), she can observe how the different light conditions affect the plant height. This will allow her to directly test the impact of light on plant growth.

Why the other options are not correct:

A.Put the different type of seed in each pot:  

This would introduce a confounding variable because different types of seeds might have different growth patterns. The experiment is supposed to test the effect of light on plant height, so using the same seed type in all pots is crucial to isolate the effect of light.