If plants develop to protect themselves in their growth why are all plants and flowers not poisonous?
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To add, a plant has to survive against many attackers; animals, birds, fungi, bacteria, virusus, other plants, insects. It will employ many chemical defenses against the worst it encounters, but hasnt got the energy for everything as it must try and grow as fast as it can to outcompete other plants. Its a balance and for some plants being eaten occassionally is a price they will pay.
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