Students want to determine the impact of soll erosion from the development of new housing. They plan to measure the density of a species of algae growing along the bottom of a river that flows
through their town. The town is built in a heavily forested area, but a large area of trees along the river was recently clear-cut to allow for the construction of a
caused exposed soil to wash into the river. The river flows north to south through the town and is still forested both up- and downstream of the town
Which of the following is the dependent variable in the study?
A) The tract of land that was clear-cut for the housing development
B) A tract of land in a heavily forested area outside of town
C)The density of a species of algae growing along the bottom of the river
D) The flow rate of the tiver from north to south