GOOSEBUMPS EVOLUTION
Goose-pimples is a remnant of our evolutionary
predecessors. They occur when tiny muscles around the base of each hair tense,
pulling the hair more erect. With a decent covering of fur, this would fluff up
the coat, getting more air into it, making it a better insulator. But with a human
thin body hair, it just makes our skin look strange.
Similarly we get the bristling feeling of our
hair standing on end when we are scared or experience an emotional memory. Many
mammals fluff up their fur when threatened, to look bigger and so more
dangerous. Humans used to have a similar defensive fluffing up of their body
hairs, but once again, the effect is now ruined. We still feel the sensation of
hairs standing on end, but gain no visual bulk.
Courtesy
Google 
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