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The term black initially has been applied as a reference to the skin pigmentation light skinned african american women nude the aborigines of Australia; today it has been embraced by aboriginal activists as a term for shared culture and identity, regardless of skin colour. In both regions, they experience very high UVR exposure from cloudless skies near the equator which is reflected from water or sand. Rickets is caused by reduced vitamin D synthesis that causes an absence of vitamin D, which then causes the dietary calcium to not be properly absorbed. So, while the MC1R f gene does not significantly contribute to variation in skin colour around the world, the allele found in high levels in African populations probably protects against UV radiation and was probably important in the evolution of dark skin. This is not a problem near the equator; however, it can be a problem at higher latitudes. This accounts for the fact that dark-skinned people get visibly darker after one or two weeks of sun exposure, and then lose their colour after months when they stay out of the sun. Retrieved 3 May Studies into these populations indicates dark skin is a retention of the pre-existing light skinned african american women nude UV adapted state of modern humans before the out of Africa migration and not a later evolutionary adaptation. Sub-Saharan Africa is the region in Africa situated south of the Sahara where a large number of dark-skinned populations live. Folate also plays an important role in the development of many neurotransmitters, e.