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.

Two students are working together on an experiment that measures the effect of different liquid fertilizers on the thickness of plants’ stems. which is most likely to result in the greatest amount of error in their scientific experiment? a.one student measures the plant stem widths by using calipers. the other student measures the widths of the same plant stems again by using a different pair of calipers. b.one student measures the plant stem widths by using calipers. the other student types the measurements as they are taken into a computer spreadsheet. c.one student weighs liquids for the experiment by using a calibrated scale. the other student weighs liquids for the experiment by using a different calibrated scale.