Yep. That’s why Caucasians vary from snow white blond and blue in areas will little sunlight in northern Europe to as dark as any African in sunny southern India.
Drop a colony of Swedes in south India and they’d be so badly adapted that they couldn’t survive generationally, so many would die young of skin cancers that there wouldn’t be enough elders to pass on wealth and wisdom.
Swap a family of southern Indians with the swedes in Sweden and (unless the figured out the secret of eating seal liver) they’d suffer from vitamin-D deficiency and rickets.
Caucasians all, just adapted to local conditions.
Right, that’s why the Boers died off in South Africa instead of building Africa’s only first world nation. The fair haired, fair skinned Boers.