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well, the hair on top of our heads protect our head from too much sunlight, our eyelashes to prevent dirt from entering our eyes, our eyebrows to prevent anything that pours on our forehead such as sweat from going to our eyes, and the hair on our skin helps, i think, to the deliver the oils from the pores of our skin to the top of the skin. The feathers on a bird I think helps keep them light so that they'll fly, since they need covering that isn't very heavy, to prevent them from i think for the same reason we have hair on our heads.

What else can I help you with?