What is the primary difference between C4 and CAM pathways? *
a. CAM plants do not use an alternate form of carbon fixation
b. Carbon fixation is anatomically separated from the Calvin=Benson cycle in C4 plants, whereas the separation in CAM plants is not structural but temporal
c. C4 plants, unlike CAM plants, are unable to use their stomata to regulate gas exchange
d. Opposite of C4 plants, CAM plants fix carbon in bundle sheath cells and the Calvin-Benson cycle occurs in the leaf mesophyll