Question

in an experiment testing how different amounts of sunlight affect plant growth. plant growth time of day type of plant amount of sunlight

Explanation:

In an experiment testing the effect of different amounts of sunlight on plant growth, the independent variable is what is being changed or manipulated, which is the amount of sunlight. The plant growth is the dependent variable (what is being measured), time of day and type of plant are usually controlled variables.

Answer:

D. Amount of sunlight