5. Plot data for stomatal density from artic birch Betula nana and atmospheric carbon dioxide concentration in the years 1898, 1939, and 2004. 200 180 160 140 120 100 80 60 40 20 250 275 300 325 350 375 400 425 450 Atmospheric CO2 Concentration (ppm) 6. Use the plot from Question % to describe the relationship between stomatal density and atmospheric carbon dioxide concentration. What do these results suggest about the manner in which climate change can affect biodiversity and evolution? Stomatal Density (#/mm2)

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