The C4 cycle
a. replaces the carbon fixation stage of the Calvin cycle.
b. supplements the activity of rubisco by providing a second source of 3PGA for the
reduction stage of the Calvin cycle.
c. is more efficient than the Calvin cycle because less ATP is consumed in the process.
d. ensures that CO2 is provided to rubisco and thus prevents photorespiration.
e. is most commonly associated with plants living in humid climates.
D
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