You had an ancestor with more hair that had goose bumps to raise that hair. Evolution is the change in allele frequency over time in a population of organisms.
So, by evolutionary process human populations lost the hair along the way, but the mechanism to erect that hair is still with us because something so trivial does not impact reproductive success and is invisible to natural selection.
Second answer
The hair-raising mentioned above was used by our early ape-like ancestors to make themselves look bigger. For example, chimpanzees, our closest genetic cousins, often raise their hair when competing with other males for mating rights and or the alpha position. Bigger usually equals stronger in nature, so the individuals who could make their hair stand out the most were more likely to scare away competitors.
As the human lineage split form the original ape-like ancestor (the other line becoming chimps), we began to lose our hair to better deal with life on the hot savannahs of ancient Africa. As explained above, hair-raising offers us no survival advantage in the modern world. But the fact that we still have this reflex attests to its effectiveness in the past. Goosebumps are therefore "vestigial." A more extreme example of vestigial body parts would be the non-functioning leg bones located in the rear of Wales.
Yes the word goosebumps is a noun. It is the plural of goosebump.
The arrector pili muscle is the structure responsible for pulling on the hair follicle, causing it to stand up and creating goosebumps. This muscle contracts in response to cold or emotional stimuli, causing the hairs to elevate and creating the appearance of goosebumps on the skin.
Goosebumps can generally occur on any part of the body where hair follicles are present. However, areas with fewer hair follicles, such as the palms of your hands and the soles of your feet, may be less likely to develop goosebumps.
The muscle responsible for the goosebumps appearance is the arrector pili muscle. When stimulated, this muscle contracts and pulls on hair follicles, causing them to stand upright and creating the appearance of goosebumps on the skin.
You can find an overview of stelar evolution in the Wikipedia article entitled "Stellar evolution".
goosebumps came out on 1990.
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You can't purchase Goosebumps clothing.
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People get goosebumps when they're cold, or thrilled. Goosebumps are caused by tiny muscles, controlled by nerves to keep you warm.
The author of goosebumps is RL Stine.
Yes the word goosebumps is a noun. It is the plural of goosebump.
The stories in Goosebumps books are fictional.
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This isn't likely, but is possible. There may be a Goosebumps ad game.
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