500
I am testing the affects of caffeine on plant growth. I have three plants: Plant A has no caffeine, Plant B has 2 grams of caffeine in the soil, and Plant C has 5 grams of caffeine in the soil. Plant A and B are placed on the window sill Plant C is placed in the closet. Is this an experiment? Why or Why not?
NO... All plants need to be in the same place (window sill) to control for outside variables such as sunlight.