Question

why hair is necessary on the skin?

Answer 1

To prevent from sun rays and from dust particles
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Answer 2

...Hair is great for running your fingers through and growing make-a-statement goatees, but having hair was once far more purposeful than simply serving as bodily ornamentation. For early humans, hair kept them warm, protected them from cuts and scrapes, provided camouflage, and even served as a nice handhold for the young. They were much hairier than modern humans, and the reason that we lost a lot of body hair over time isn't because we invented heaters and parkas. More likely, our ancestors started hunting in hot, tropical areas -- and bare skin adds to the efficiency of our cooling system. The reason why we kept the tuft at the top? Many experts agree that it had to do with a mating ritual that went a little something like this: The male with the most impressive hair -- or he who could make it look that way -- frightened away his rivals, got his girl, and fathered the next generation