Then prove it.
That's all false.
Genes are data. And the genes tell everything; genes cannot lie. Genes explicitly show to everybody that race and ethnicity exists.
The "social constructs" begin when some people want to deny their own race, or, the race of other people. Those motives should be questioned more strongly than "the existence of race". Why are some people so determined to 'erase' their own race?
Not really, most ethnicities and races inter-breed within themselves.
For example, the Chinese and Japanese have not mixed with Africans or Europeans, during the "last 500+ years". They've been isolated and don't necessarily welcome outsiders or encroachment against their women.
The truth is, some race's women are "easier" to take than others.
Genes are data and data is interpreted by people. Without that interpretation those genes tell us nothing. Moreover, the concepts of race existed far before genetics ever came around. All genetics can ever do is say that such and such race shows such and such genetic signatures. It doesn't define races.
The development isn't, but the being of Polishness is historical. I'd be really pissed if my ancestors suffered so I could live on their land and then have some dude with no historical tie to the same soil call himself my equal as a compatriot. It's absurd. And the very definition of ethnicity includes a belief in a shared historical origin. I guess in the case of Poland this goes back to our days as half-men in Africa? Or perhaps even farther back, to the first mammal? Or even the first amoeba?
There s nearly a dozen. We re mostly a mix of two closely related ones, in Europe.
Thinking nature would politely restrain herself just for humans, when differents races of animals are everywhere, is already a bit pretentious.
Yes, this is just a coincidence
https://static.iq-research.info/2015...by_country.png
http://especiales.elgrafico.com/2012...eut1166628.jpg