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The earliest primate ancestors of modern humans most likely had light skin, like our closest modern relative — the chimpanzee. Relatively dark skin remains among the Inuit and other Arctic populations. Outside the tropics UVR has to penetrate through a thicker layer of atmospherewhich results in most of the UVB reflected or destroyed en route; because of this there is less potential for vitamin D biosynthesis in regions far from the equator. The native people of Bougainville, Papua New Guinea, have some of the darkest skin pigmentation in the world. Eastern odyssey24—26 doi: Retrieved 11 December This disease in the past was commonly found among dark-skinned Americans of the southern part of the United States who migrated north into low sunlight environments. Another group of hypotheses contended that dark skin pigmentation developed as antibacterial protection against tropical infectious diseases and parasites. A few million years of evolution later, early humans had sparse body hair and more than 2 million sweat glands in their body.