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Originally Posted by UtterParadox
plants feel pain
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The pheromones is a possibility I'm sure, but I doubt that plants can actually feel 'pain'. They have no central nervous system and therefore no 'pain receptors' - since they're generally immobile they don't need them, unlike mammals (e.g negative reinforcement for stepping on something sharp... the pain teaches the mammal not to do this again... or if there is a wound pain makes the animal protect that area which prevents infection or making it worse). As evil as the world is, I doubt evolution would've given plants to feel pain just for the hell of it.
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