There аre fоur lаrge аnt mоunds in yоur yard. As you are watching television, you see an advertisement for Ant-B-Gone. You purchase Ant-B-Gone with the intent of applying it to three of the four ant mounds. You decide to add 10 grams of Ant-B-Gone to one mound, 20 grams to a second mound, and 30 grams to a third mound. A fourth mound is left untouched. You develop a hypothesis that applying Ant-B-Gone does not influence the number of ants killed. You observe the ant mounds over a week. In this experiment, what is the dependent variable?