ASSIGNMENT Potometer results for Plant A and Plant B Environment al conditions Average distance that the air bubble moved in four six-minute trails (cm) Plant A Plant B Normal 5,2 1,9 High humidity 3,5 0,4 Bright light 7,6 3,4 Wind 9,9 4,5 3.1.1. Which environmental condition represent the control in this investigation. (1) 3.1.2. Why is it necessary to have a control in any investigation? (1) 3.1.3 Tabulate TWO visible differences between Plant A and Plant B (5) (7) 3.3.​