The Crassulacean Acid Metabolism (CAM) pathway is a photosynthetic process used by some plants to adapt to arid environments. In this pathway, plants open their stomata at night to take in carbon dioxide, which is then stored as malic acid. During the day, the stomata close to reduce water loss, and the stored carbon dioxide is used for photosynthesis. This adaptation allows CAM plants, such as succulents and cacti, to thrive in conditions where water is scarce. By minimizing water loss while still capturing sunlight for energy, these plants efficiently manage their resources in challenging climates.