The clarity of lake water is affected by the amount of phytoplankton (marine plants), soil, clay, and
other solids suspended in the lake. Suppose the concentration of carbon dioxide in the atmosphere
changed from 340 ppm to 380 ppm from 1980 to 2005. What effect would this have on the
occurrence of the full body plate trait? Explain your answer. Hint: Think about how carbon dioxide is
related to photosynthesis.