I think humans are part of the natural world for the reasons you said (we are biological organisms and still rely on nature), but we also overcome and extend beyond what is natural, which is exclusive to humanity as a species.
Parks and trees exist in cities, but by no means are symbiotic. They're there because we choose them to be there. Symbiotic would be us digging holes into mountainsides or the ground, not killing everything beneath us with cement to build a sturdier foundation (cement, by the way, also not a natural substance, so anything made out of it is unnatural).
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