Question

when a test tube of water containing elodea (an aquatic plant) is placed near a white light, the plant gives off gas bubbles. when elodea is placed near different colors of light, the rate of bubbling is affected. the dependent variable in this experiment is the
○ color of light source
○ distance between plant and light source
○ the rate of gas bubble production

Explanation:

In an experiment, the dependent variable is what is measured or observed (depends on the independent variable). Here, the independent variable is light color, and the rate of gas bubble production is what's affected/measured. The other options are either independent variables (color) or not part of this experiment's focus (distance).

Answer:

the rate of gas bubble production