@shortstories If you want to get right down to it, we all appear to have a relationship with each other, every form of life, every animal, plant, single celled organism, there are some genes such as those having to do with energy production or transcribing DNA to RNA, these things are common to almost if not all life forms. At some point when there is enough genetic drift, it is no longer possible to line up chromosomes and form a new organism, too many pair mismatches. Australian Aborigines are the only human beings on Earth that we know have some difficulty reproducing with other humans, and even for them it is not impossible, but this comes from 40,000 years of genetic isolation. In addition every modern human language in existence can be traced back to a common language in Africa. So yea regardless of what racists say we are the same species. And as much genetic variability that there APPEARS to be within human beings, it is actually much less than that of many other species because humans went through a genetic bottleneck between 150,000 and 200,000 years ago in which there were believed to be fewer than 1000 individuals world-wide.