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Lettuce rots when you expose it to air for a long period of time. After that long period of time mold/ fungus can grow on it by sinking its hyphae into the lettuce and absorbing all of the nutrients. It can also rot by bacteria. If you leave lettuce in the open for a long period of time tiny bacteria that flies in the air can land on the lettuce and have a tasty snack.

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15y ago

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