According to fossil records and recent published observations, two species of leaf-eating beetles (species A and B) have existed on an isolated Island in the Pacific Ocean for over 100, 000 years. In 1964 a third species of leaf eating beetle (species ) was accidentally introduced on the island. The population size of each species has been regularly monitored. What is the independent variable in this experiment? A. Patient A has diabetes because the patient's initial blood sugar levels dropped over time. Patients has diabetes because the patient's initial blood sugar levels increased over time. C. Patient A has diabetes because the patient's initial blood sugar levels increased over time. D. Patients B has diabetes because the patient's initial blood sugar levels decreased over time.