what the hell? what do you mean? the difference between me and a white person is that we are of different races. that alone doesn't make one of us better than the other, but it is something different about us, among probably several other things. unless you mean something more with "distinct biological" in your description, I don't know what you're talking about.
What he's saying is genetically, there is no such thing has different human races... The term race is something people use to explain what amount to minute genetic variations between individuals. And this use started before people had real any understanding about the genome...
It's a misnomer. Biologists and anthropologists don't recognize race as a valid classification because there's generally more genetic differences between individuals within a group than there are between groups. So assigning 'races' based solely on a few inherited physical characteristics is arbitrary.