​Why Do We Have Eyebrows? Multiple Choice Grammar Test

In his (1) _________ weird book The Expressions of the Emotions in Man and Animals, Charles Darwin maintained that human eyebrows (2) _________ from the vestigial remnants of the scattering of long hairs one finds in the very same place on other mammals, including chimps and dogs. But why were eyebrows preserved, while most of the rest of our hair was lost?

In accordance with (3) _________ views on sex selection, he believed that those human hair which remain are those which are (4) _________ to the opposite sex.

However, another suggestion is that they’re important for (5) _________ facial expressions that are more easily recognized by other individuals in one’s social group.

They also serve the practical purpose of stopping sweat and rain (6) _________ down your forehead into your eyes.