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… relevant to living on a changing planet. Transcript for Audio   ALISON:  Hey! I’m Alison Takemura at the US … to living on a changing planet. In this short audio production, we’ll hear from Karolina Heyduk, an evolutionary … called crassulacean acid metabolism, or CAM — that’s C-A-M, for short — helps plants that have it lose less water in a …