Welcome to the fray Wolf.
and have not been able to find how organisms evolved poison.
Are you aware that plants also engage in toxic warfare? Many plants are toxic to consume of course, but there are also plants that emit toxins into the soils to poison the ground to other plants, thus ensuring more nutrients are available for its own growth.
And you don't need to look far to see one: oak trees. (ever wonder why you can't grow good grass under oaks?) it's called Allelopathy.
http://www.sustland.umn.edu/implement/trees_turf.html
Enjoy.
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