Based on the fact that CO2 is often limiting for photosynthesis,what might you conclude about the evolution of photosynthesis?
A)Photosynthesis evolved when environmental concentrations of CO2 were low. B)Photosynthesis evolved when environmental concentrations of CO2 were high. C)CO2 levels likely did not have a bearing on the evolution of photosynthesis. D)Photosynthesis evolved in a greenhouse.