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| Description: CAM (crassulacean acid metabolism) photosynthesis is largely limited to succulent plants in arid and semiarid environments. In both C3 and C4 plants, the light-dependent and Calvin cycle reactions all occur during the day. In CAM photosynthesis, carbon fixation typically takes place at night, when lower temperatures reduce the rate of water loss during CO2 uptake. CAM plants fix carbon by combining CO2 with PEP to form four-carbon acids. These acids are stored until daylight, when they are broken down into pyruvate and CO2, which then enters the C3 photosynthetic pathway
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