Answer:
bumps that form on you to warm you up.
its evolutionary.....amblulocetus was a prehistoric creature that lived after the dinosaurs...it was a type of aquatic mammal, in fact the ancestor of present day whales...but it had four legs...if u look at present day whale skeletons, you can see two small leg bones at the beginning of the tale....the common day whales have leftovers from their ancestor.........if you look at OUR ancestors, the primitive homosapiens....you'll notice that they have thick fur, it fluffs up to keep warm and it poofs out when they are frightened (to look bigger).....thats exactly when we get OUR goosebumps, when we're cold and scared!! Goosebumps are just lefovers!! :)