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Why do humans have eyebrows? It seems that it isn't necessary but only humans have them, correct? So what is the use of them for humans? I hear that they protect our eyes. However, isn't that what eyelashes do? What other functions do eyelashes have?

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  • $\begingroup$ I think apes have them, look up chimpanzee picture. $\endgroup$ – AliceD Jan 23 '15 at 22:07
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    $\begingroup$ I'm voting to close this question as off-topic because it shows no research effort $\endgroup$ – Raoul Jan 23 '15 at 23:12
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Eyebrows function to protect the eyes from perspiration and provide shade.

Eyelids function to protect the eyes from foreign objects and sunlight.

Eyelashes function to protect the eyes from foreign objects, produce sebum (a lubriant that the eyelids) and acts as protection for the eyes from tears [1].

The above seems to be backed up by health how stuff works and the anatomy of the eye from emedicinehealth.

However, note that biologist dont have any concrete reasons for the eyebrow. This is just what many of them agree on I suppose. Here is another resource from sciencefocus.

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    $\begingroup$ What about facial expressions? $\endgroup$ – AliceD Jan 23 '15 at 22:08

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