Sally has three identical plants. plant a is given 100 ml of soda, plant b is given 100 ml of orange juice and plant c is given 100 ml of water. each plant is put in the same type of pot and is given the same amount of sunlight each day. sally records the height of each plant once a week for a month. what is the independent variable in sally's experiment? a the liquid used in each plant b the height of each plant c the amount of liquid given to each plant d the amount of sunlight exposed to each plant