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Researchers at the University of Utah in 2004 found that human skin contains photoreceptors like those in the retina, allowing it to mount an immediate defence against damaging ultraviolet radiations.
They suspect that the protein that protects the skin from sunlight evolved following the loss of protective hair, which happened about 1.2 million years ago.
According to some researchers, wearing clothes may predate early human global migrations by an additional 70,000 years.
In this case, the migrations were themselves facilitated by the innovation of clothing.
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In some situations, a minimum amount of clothing or none at all may be considered socially acceptable, while in others much more clothing may be expected.
Social considerations involve cultural issues of modesty, subjective decency and social norms, besides other considerations, and these may depend on the context. Full nudity refers to complete nudity, while partial nudity refers to less than full nudity, with parts of the body covered in some manner.
Hair probably evolved in mammals before about 220 million years ago.
The closest living genetic relatives of humans, apes and especially chimpanzees, possess an almost complete covering of fur.
This lack of behavioral adaptation, in turn, may have contributed to their eventual extinction during ancient climate changes when they may have succumbed to hypothermia, frostbite and other cold ailments.
The amount of clothing worn depends on functional considerations, such as a need for warmth, as well as social circumstances.
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