eli5; Why are all plants not poisonous

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If plants develop to protect themselves in their growth why are all plants and flowers not poisonous?

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Anonymous 0 Comments

Plants do not develop to do something*. The most successful plants fill a niche where there are only few species that eat them, and more species that spread their seeds through eating parts of the plant or through pollination.

A plant that is poisonous to all species won’t survive.

*same goes for animals and partly for humans (humans actively change their surroundings)

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