It depends on how taxonomic classifications are applied in the ever-changing world of PC biology.
In one article I read some time ago, a criminal forensics expert said that there were at least 21 significant physiological differences (bone lengths, muscle fibers, cranial structure, blood groupings, brain fissuring and volume, etc.) between Whites and sub-Saharans. In Darwin's time, Galapagos finches with the single difference of bill structure or toe length/placement were classified as different species, and Darwin based his categorization on consistency and heritability of characteristics. Using his method, we are different species, or at least, different subspecies.
Our evolutionary histories produced beings which function well in their respective environments. Africans filled the evolutionary niche of higher hominids in Africa, and Europeans (and northern Asians) in northern areas, with us superseding the competing local hominids (Neanderthals) over time.
The dividing line between species was set at cross-fertility, but this has also been amended by biologists blurring or erasing species categories. For instance, dogs and wolves have traditionally been in separate species (Canis familiaris and Canis lupus) because they are consistently, obviously, visually, objectively different to anyone. But some "scientists" now say they're on the same "continuum", because they easily cross-breed. And that "logic" has been applied to Europeans vs. Africans.
The "Africa as womb of humanity" theory has a snag for the PC crowd. If we agree that Africans were the prototypes, their "descendants" (Whites and Asians) evolved beyond them and left them behind. We got better at "being human", they stagnated.
Yet, if independent, environmentally-driven multiregional evolution from Homo erectus is in fact the case, they still come out lower. Blacks are then simply one of three or more end-products of that evolution, but the one most closely resembling the root species, which also indicates they are less evolved.
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