I don't really think (know) if they exist and have said that since the jump. I believe in exceptions and accept them in hard sciences. You are requesting definitive AND exclusive, you just seem to swap those words intermittentlyLet's say you list the definitive traits for a race (which I'd like to note you have NOT).
I think you are misdirecting the conversation intentionally by applying your own standard of 'proof' (definitive and exclusive traits) to the entire argument then brow beating people for not meeting your self-declared standards of proof, been doing this for 20+ pages.
See above, I am not attempting to source definitive and exclusive race group traits in order to support my belief that race is a valid biological classification system for humans.You feel that some members of that race may not display those traits. So how would you identify which race they belong to, if you found that person in isolation?
If I found a person in isolation I would not assume every one of his ancestors lived in isolation for all history of the species, so that persons genetics traits I would not assume to be definitive or exclusive to any race.