Which of the following statements correctly describe(s) the relationships shown on the graph? Statement 1: At high light intensity an increase in carbon dioxide concentration from zero to low causes an increase in the rate of photosynthesis. Statement 2: At high light intensity an increase in carbon dioxide concentration from high to very high does not increase the rate of photosynthesis. Statement 3: At low carbon dioxide concentration an increase in light intensity from low to high does not change the rate of photosynthesis.