they have never had to plan ahead to survive. necessity is mother of invention. sub tropical and tropical climes for generations. dna has memory. storing up for winter and saving seed stock to survive colder climes was not necessary for them to survive. so conceptualizing wasn't instilled either. and they are cush hammites not japheth lineage Recovering signals of ghost archaic introgression in African populations [19 percent archaic DNA not found in asians or caucasians] 'While introgression from Neanderthals and Denisovans has been documented in modern humans outside Africa...Our results reveal the substantial contribution of archaic ancestry in shaping the gene pool of present-day West African populations. https://www.science.org/doi/10.1126/sciadv.aax5097