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Oxygen is natural because it "comes" that way ... two molecules of O, stuck to each other. It's not FORCED into that configuration by photosynthesis.
Consider ... Uranium, naturally occuring element.
Plutonium ... only exists because man tosses additional neutrons in Uranium's general direction which are absorbed by the nucleus, creating this new artificial element. The trans uranicelements IIRC (it's been a good 25 years since I did any hard science), are similarly constructed -- Don't occur in nature, some only exist briefly in the lab.
When the whale uses it's penis to make another little whale, that's part of the process of nature.
When Uncle DuPey uses an assortment of hydrocarbons to make paint and plastic and a myriad of other things that make living better, that's chemistry ... and while the components are organic molecules, it's not natural, dammit!!
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