"Crassulacean acid metabolism" (CAM) is used by plants when its living conditions don't have a lot of water. (It's a very complicated night-day routine, but long story short the stoma in the plant stays closed during the day to save the water, and opens at night to collect CO2.)
I used my wallet in place of the normal cookie, because I was at a fruit market and didn't have a cookie with me. Pineapples use CAM because they grow in tropical regions that don't get much rain.
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