> The populations from which the Moroccan and Tanzanian fossils come from may have died out without contributing to the gene pool of living humans. I find this

> The populations from which the Moroccan and Tanzanian fossils come from may have died out without contributing to the gene pool of living humans. I find this highly unlikely. The groups inhabited the same continent, potentially for thousands of years. There would almost certainly have been some degree of interbreeding, even if some groups didn't end up contributing very significantly to our modern genome.