How did the hunter-gatherers find out the importance of a plant?

or:How did the hunter-gatherers find out the importance of a plant?or:What are you thinking? Like a bunch of cave men used to sit around a camp fire

or:How did the hunter-gatherers find out the importance of a plant?

or:What are you thinking? Like a bunch of cave men used to sit around a camp fire and discuss esoteric concepts such as the importance of plants?

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