Wild tobacco plants evolved tobacco as a defense mechanism? Tobacco paralyzes most insects after ingestion which keeps it from being devoured and helps it survive where it grows best, which is in the desert surprisingly. Various insects are immune to the paralysis caused by ingesting tobacco, insects like the hornworm caterpillar. The tobacco plant sends off chemical signals when it is under attack from an insect, signals to nearby tobacco plants to alert those other plants of the predator which...
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