CAM Plants, Such as Cacti and Agaves, Use a Different

CAM plants, such as cacti and agaves, use a different carbon-fixing pathway than most other plants, allowing them to ____.

A) keep their stomata open all day and night to increase the efficiency of photosynthesis
B) keep their stomata closed all day and night to decrease the amount of CO₂ absorbed
C) open their stomata only during the day to increase the amount of CO₂ absorbed
D) close their stomata only at night to reduce the amount of water lost to evaporation
E) open their stomata only at night to reduce the amount of water lost to evaporation