A simple answer to your question is the allmammals have hair. It is among the criteria thatscientists use to classify mammals (to separatethem from various other vertebrate pets such as birdsand reptiles). This method that even whales,elephants and also dolphins have actually body hair!Whymammals developed hair in the very first place us canonly guess at, since no one knows for certain whyevolution go one method or the other. Yet a goodguess would be that we evolved hair (or fur) toconserve body heat. Mammals space warm-blooded,which method that we need a high inner bodytemperature to survive. Very couple of animals otherthan mammals are warm-blooded. (For example, theinternal temperature of most fish and reptiles isdictated by the temperature of their environment.In Antarctic fish, human body temperatures can be closeto freezing! To uncover out why the organization in thesefish don"t freeze, inspect out this web page:http://www.tc.cornell.edu/Edu/SPUR/SPUR94/Reports/SPUR_Adam_Report.html.)One benefit to being warm-blooded is the warmermuscles deserve to contract faster, so animals with highbody temperatures deserve to fly or run on brief notice,even when it"s cold outside. (Insects can"t dothis!)A class of hair or fur also as thinas the hair on our arms have the right to trap air and create aninsulating layer in between our skin and the coldertemperatures outside. The more thick the fur and also theoilier it is the better the insulation. Obviously,the hair on a seal is going to it is in a lot betterinsulator 보다 the hair on our arms, but even alittle little of hair helps. Birds, back notmammals, execute this insulation trick also: castle havea class of an extremely fine feather right beside theirskin (called down) i beg your pardon traps air and also keeps themwarm. Humans loosened most the our warm from ourheads, so it provides sense that we have actually a many ofvery special hair on our heads. Ours legs and armshave lots of an effective muscles and are easilychilled, for this reason it makes sense that they have morehair too. Our eyelashes defend our eyes from dustand other little particles. Our eyebrows may helpto cushion the large bones over our eye sockets,which stick the end to safeguard our eyes and foreheads.Other face hair is much more complicated, and iscontrolled by hormone (this is why guys havebeards and also women carry out not, and why males do notdevelop beards till they go with puberty).There has been a gradual trend towards aloss of body hair in human evolution. MY theory ofwhy this is (unproven and untested!) is the it iseasier to increase body temperature when cold thanit is come decrease human body temperature whenoverheated. Humans have the right to shiver, burn stored fat, oruse shelter and clothing to remain warm, yet to cooldown we should sweat, and also this involves a many ofwater loss. Excess hair would make overheatingeven more likely. Due to the fact that humans can easily diewhen too hot or also dehydrated, development may havesteered us toward much less body hair. However, thisdoesn"t explain why mice the live in the desertstill have thick coats the fur.

Answer 2:

Biologists look in ~ questions favor this in twoways: What go it do for us now? and also How did weget it?All mammals (things that offer milkto their young) have hair.We"re mammals, for this reason itmakes sense that we have actually hair. For most mammals,hair is important as insulation, keeping body heatin when it"s cold and giving defense from hotsun. Person hair might be beneficial for maintaining thehot sunlight off our head and neck, yet it doesn"t domuch to keep us warm.Another questionmight be "why carry out we have so tiny hair?" Thereare few bald mammals. Some marine mammals likewhales and dolphins have actually no hair when they"re born(though they have actually hair together fetuses). Hair createsdrag in water (human swimmers frequently shave theirbodies). An additional bald mammal is the nude molerat, which stays in the hot sand the the SouthAfrican Deserts. Some human being say they"re theugliest mammal in the world. You it is in thejudge:http://web3.si.edu/organiza/museums/zoo/zooview/exhibits/nmrats/nmrhome.htmBiologistsmight imply that we have actually so little hair becausewe progressed in a warm climate wherein some protectionfrom the sun was good, but much more hair made us toohot. When we moved to cooler climates, clothes,fire, and also shelter assisted us survive.Thesecond part of your question is why we have actually itwhere we have it. Every one of our bodies except forour palms and also the soles of ours feet have actually somehair, it"s simply short and fine. In reality chimpshave around as plenty of hair follicles as we do, it"sjust that each hair is longer. In ~ puberty, bothmales and females get hair in your armpits andpubic area due to hormonal signals. Some peoplesuggest that this in reality helps to hold in odorsthat signal the a person has actually reached sexualmaturity. What carry out you think?Males getfacial hair. This might be a signal that he hasreached, or is reaching, physics maturity.

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Othermale animals have signals choose this too, forexample the lion"s mane. Why would this it is in animportant signal?Thanks for asking.