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An epicanthic fold or epicanthus [6] is a skin fold of the upper eyelid that covers the inner corner (medial canthus) of the eye. [3] However, variation occurs in the nature of this feature and the possession of "partial epicanthic folds" or "slight epicanthic folds" is noted in the relevant literature.
The rate of eye evolution is difficult to estimate because the fossil record, particularly of the lower Cambrian, is poor. How fast a circular patch of photoreceptor cells can evolve into a fully functional vertebrate eye has been estimated based on rates of mutation, relative advantage to the organism, and natural selection.
Light, proper use of makeup was ideal. The women of Osaka and Kyoto were ridiculed as they used heavier makeup than the women in Tokyo, considering them to be "yabo" (rough). [7] Slim and fragile women with up turned eyes and narrow faces also began to be the ideal, shifting away from the preference of plumpness. [8]
Black hair can come in a variety of textures, just as any hair color. Generally, the East Asian, Central Asian and Native American population has straight hair with a very thick cuticle layer [5] and South Asians have thick, wavy or curly hair, [6] while the general hair type seen in black African hair is thick, curly and dense with more hair ...
The colored part of the eye is the iris, it controls how much light is let into the eyeball and its color is determined by melanin, just like skin and hair. Darker colors absorb more light, and ...
The Denisovan genome from Denisova Cave has variants of genes which, in modern humans, are associated with dark skin, brown hair, and brown eyes. [49] The Denisovan genome also contains a variant region around the EPAS1 gene that in Tibetans assists with adaptation to low oxygen levels at high elevation, [ 50 ] [ 16 ] and in a region containing ...
Human eye. The cooperative eye hypothesis is a proposed explanation for the appearance of the human eye. It suggests that the eye's distinctive visible characteristics evolved to make it easier for humans to follow another's gaze while communicating or while working together on tasks. [1] [2] [3]
The irises of human eyes exhibit a wide spectrum of colours. Eye color is a polygenic phenotypic trait determined by two factors: the pigmentation of the eye's iris [1] [2] and the frequency-dependence of the scattering of light by the turbid medium in the stroma of the iris. [3]: 9