Wild tobacco plants in the American Southwest don’t just defend themselves. They remember. When a tobacco hornworm caterpillar takes its first bite, the plant detects specific chemicals in the insect’s saliva. That signal activates genes across the entire plant, triggering rapid production of nicotine and bitter defensive compounds. At the same time, the plant releases airborne chemical signals that warn nearby wild tobacco plants to begin preparing their own defenses. But here’s the strange par
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