why do humans have eyebrows ?

Answer 1

The main function of the eyebrows is to prevent moisture, mostly salty sweat and rain, from flowing into the eye, an organ critical to survival. The typical curved shape of the eyebrow (with a slant on the side) and the direction in which eyebrow hairs are pointed, make sure that moisture has a tendency to flow sideways of the eyes, along the side of the head and along the nose. The slightly protruding brow ridges of modern humans could also still play a supporting role in this process. Together with the eyebrows, the brow ridges also shade the eyes from sunlight.

Eyebrows also prevent debris such as dandruff and other small objects from falling into the eyes, as well as providing a more sensitive sense for detecting objects being near the eye, like small insects.

Eyebrows also have an important facilitary function in communication, strengthening expressions like amazement or anger.

Answer 2

They prevent sweat running into your eyes. You'll notice that women have small eyebrows telling you that they never sweat much.

Answer 3

Stop's the sweat running into your eyes.

Answer 4

2 cover their eyes from sun and Rays

Answer 5

To protect our eyes from sweat and debris.

Answer 6

To keep dirt and other particles out of our eyes -- it's the same reason that we have eyelashes.

Answer 7

stop sweat running into eyes

Answer 8

well I was going to say something but looks like everyone pretty much covered it.

Answer 9

stop sweat and absorb light

Answer 10

Because they would rather shave their moustache or legs.