what are the function of hair ?

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Hair absorbs harmful radiations from the sun.It keeps out coarse dust particles, as in eyelashes, hair in the nasal chambers and ear canals.Beard and moustaches are for differentiation of gender. This shows a man is different from a woman. It protect from sun and rain. It also prevents water from entering into skin.Impart colour to body.These are all functions of hair, for more look up;http://www.sikhpoint.com/religion/resources/humanhair.htm

No....hair was originally for temperature regulation a long time ago in humans. Currently, after evolution, and with new technological advances, hair is not used anymore. It's just dead cells that we humans use for our looks. Our hair basically has no function now.And no, the hair does not shield you from the sun's UVA UVB radiation. That's what melanin does inside your skin cells, guarding your cells' nucleus from the radiation coming from sunlight.