Why do we have eyebrows? You have to pluck them and prune them, so why do they even exist? Aside from being a very distinct feature on your face that helps you communicate, there's actually a very good reason eyebrows exist. If you've ever run longer than to catch a bus, you know just how sweaty your forehead can get - sweat can even drip down into your eyes and cause temporary blindness. And that's why your eyebrows exist. Consider them a built-in headband!
#7 that's a pretty darn cool factoid. guess i'll have to research to determine if true.
#8 some human-engineered fruits do not contain seeds, so a better way to understand the botanical term is "fruit is the product of a fertilised flower."