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Plant Immune systems, actively defend themselves against pathogens and insects by sealing off and destroying infected cells, increasing levels of salicylic acid throughout the plant seems to turn on plant defenses, increasing levels of salicylic acid throughout the plant is same ingredient in aspirin, actively defend themselves against pathogens and insects by producing chemicals to communicate with other plants when attacked telling neighbors to secrete poisons to protect themsleves., Plant Immune Systems are not real immune systems, but they do actively defend themselves against pathogens and insects, actively defend themselves against pathogens and insects by increasing levels of salicylic acid throughout the plant, actively defend themselves against pathogens and insects by producing poisons