They are cAM Plants

Some plants that are adapted to dry environments, such as cacti and pineapples, use the crassulacean acid metabolism (CAM) pathway to minimize photorespiration. This name comes from the family of plants, the Crassulaceae, in which scientists first discovered the pathway.

why them?

 They are cool as they can undergo arid temperatures without drying out

CAM Plants

why they don't need lots of water to survive

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