1.Identify the independent variable: The independent variable is the factor that is being changed or manipulated in the experiment. In this case, the amount of blood in the water is being increased2.Identify the dependent variable: The dependent variable is the factor that is being measured or observed in response to the changes in the independent variable. Here, the amount of sharks in the area is being measured3.Identify the control variable: The control variable is the factor that is kept constant throughout the experiment to ensure that any changes observed are due to the independent variable. In this experiment, the control variable could be the size of the area, the type of water (saltwater or freshwater), or the presence of other prey species