. Based on the data in the scatter plot, estimate the percentagechange in dry mass of corn and velvetleaf plants if atmosphericCO2 concentration increased from 390 ppm (current levels)to 800 ppm. (a) What is the estimated dry mass of corn andvelvetleaf plants at 390 ppm? 800 ppm? (b) To calculate thepercentage change in mass for each plant, subtract the massat 390 ppm from the mass at 800 ppm (change in mass), divideby the mass at 390 ppm (initial mass), and multiply by 100. Whatis the estimated percentage change in dry mass for corn? Forvelvetleaf? (c) Do these results support the conclusion fromother experiments that C3 plants grow better than C4 plantsunder increased CO2 concentration? Why or why not?

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