we know that human biodiversity (hbd) is true because, for one thing, we have many, many examples of it (see here)!
additionally, both the workings of the natural world and specifically the theory of evolution predict that hbd must be the case.
nature likes to throw up variety (see here for example) — the variation between individual organisms is, after all, what natural selection acts upon — and there’s no reason for humans to be any exception. add to that the fact that humans reproduce sexually — with all the genetic shuffling and remixing that happens there — and it’s inevitable that individual humans will be biologically diverse.
various groups or populations of humans — ranging from small-sized families to races and even beyond (for example, think: east asians+native americans together compared to caucasians or subsaharan africans) — will also inevitably be biologically diverse from one another, to greater or lesser degrees, due to forces of evolution such as natural selection, gene flow, and/or genetic drift.
keep in mind that humans — including various discrete-ish human populations (biological borders are fuzzy, naturally) — have experienced recent evolution (i.e. within the last 40,000 years or so), that human evolution has probably sped up since the advent of agriculture, and that we are undoubtedly still evolving today.
ignoring or denying the existence of human biodiversity won’t make it go away. hbd — and its implications — will remain a reality in spite of all your hopes and dreams, however well-intentioned they may be.
this is one of a set of posts on What is Human Biodiversity? please, before you
fire off a rant leave a comment here, check out the other posts, because your question or objection may have been dealt with in one of them. here they all are!:
(note: comments do not require an email. another great moment in evolution.)