>different

It ends up being kind of arbitrary. Defining different groups within biology becomes a matter of which 'rules' we set to distinguish between them. Rules which already doesn't work due to nature constantly pulling wild cards that disproves any rigidity in manmade rules of biology.
But we kind of went
>fuck that. Just don't look at it. Look at the stuff that fits neatly into categories instead.

That being said, there highest concentration of biological diversity is found in Africa, due to how human history played out.
But I don't think anyone would bat an eye if I told them Homo Sapiens Saltus Nigrum is different from Homo Sapiens Tenuis Oram Nigrum