40+ Why Do We Have Hair PNG. The main theory for having so much hair on our heads, is to insulate our heads. Its has to do with evolution.
With hair on our heads it protects us from sunlight and minor bumps. Hair is a protein filament that grows from follicles found in the dermis. Why keep any hair then?
Genetics is the most common cause of thick, plentiful body hair.
Its has to do with evolution. Men grow beards because the hair follicles on their jaw are stimulated by the hormone dihydrotestosterone (dht), which is produced from testosterone. Here we tell you the motives. Chεεrs, each hair you have grows out of a follicle.
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