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by CamperBob2 2576 days ago
I've read that this question can be answered by looking at the chirality of the chemical(s) in question. If the levorotatory and dextrorotatory isomers are unevenly distributed, that's a hint that the substance originated in biological processes.

Not sure if that's still the current thinking, or if it ever was, but I found it interesting when I ran across it.