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"Poisonous" does not mean deadly. Some manifestations of toxicity are subtle. The dose, as always, determines if a plant is safe source of nutrients or a toxic hazard.

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BRIEF: Are these substances toxic?

Am I understanding correctly that Ricin is a toxic substance and those listed as a Bacterium (Botulinum, Shiga, Tetanus) are actually the results of being exposed to a toxic bacteria?


All are toxic substances. Ricin is produced by plants, the other three are produced by bacteria.