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It's all physics at the bottom. Nature doesn't have APIs.
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Yes, except parent is correct. Physcial and chemical mean very different and specific things in this context.

Calling photosynthesis a physical reaction is flatly incorrect no matter how you want to look at it. It is a physics reaction, sure, but "physical reaction" specifically means a Newtonian mechanical, reversible process at the macro scale.

A "chemical reaction" specifically means a (trivially) irreversible quantum/atomic reaction involving chemical bonds at the atomic/molecular scale.

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