9. The table below shows the frequency at which the contractile vacuole of two protists empties in various concentrations of sea water. 60 Percentage concentration of sea water (%) Number of times contractile vacuole of protist A empties Number of times contractile vacuole of protist B empties per hour per hour 0 95 97 10 76 79 20 69 72 30 41 43 40 21 25 50 9 10 60 2 5 70 0 1 80 0 0 a. On the graph paper provided (use the 2mm grid scale), draw two line graphs on the same axes to compare the number of times protists A and B empty their contractile vacuoles per hour. Join the points of the graph using straight lines. Include a key. b. Using the graph, identify the number of times protists A and B empty their contractile vacuoles when the concentration of sea water is 35%. c. Explain the change in the rate of emptying of the contractile vacuole shown in the table. 9. The table below shows the frequency at which the contractile vacuole of two protists empties in various concentrations of sea water. 60 Percentage concentration of sea water (%) Number of times contractile vacuole of protist A empties Number of times contractile vacuole of protist B empties per hour per hour 0 95 97 10 76 79 20 69 72 30 41 43 40 21 25 50 9 10 60 2 5 70 0 1 80 0 0 a. On the graph paper provided (use the 2mm grid scale), draw two line graphs on the same axes to compare the number of times protists A and B empty their contractile vacuoles per hour. Join the points of the graph using straight lines. Include a key. b. Using the graph, identify the number of times protists A and B empty their contractile vacuoles when the concentration of sea water is 35%. c. Explain the change in the rate of emptying of the contractile vacuole shown in the table