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For instance, in humans estrogens function as sexual hormones, but they also occur in many plants, where obviously their role is totally different.

Some compounds, such as psilocybin have psycho-active or hallucinogenic effects in humans, but also occur in plants or fungi, who totally lack the nervous system.

I wonder, why it can happen that the same, very non-trivial compound is occuring in totally diverse organisms and plays totally different roles?

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