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The adaptations for the Barrel Cactus are ideal for their survival. Barrel Cacti have a unique metabolism that works for their lifestyle. Their metabolism lets the stomata remain closed in the daytime, which is when the most water would be lost. It then opens at night releasing the oxygen while absorbing the carbon dioxide that is normally saved as malate. The Barrel Cacti has a spine that doubles as a protective shield against its predators.

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