Darwin was among the first people to consider that perhaps every living thing on the Earth is constantly changing, and we perhaps stemmed from creatures that were more "primitive" than we.
This is where the inspiration for his book, "On The Origin Of Species," came from. Published in 1859, it convincingly argued that the theory of evolution was more of a fact than anything else.
Even though evolution seems like pretty serious business, cartoonists have been poking fun at the funnier side of it. Has evolution actually enslaved us? You be the decider!