Above - Charles Darwin, who first wrote about Evolution Below - a simple drawing explaining that the beetles who are better camouflaged are less likely to be eaten, and "Naturally Selected" to survive
The Amoeba Sisters explain Natural Selection
Above - one type of way we observe species evolve, using fossil records of their previous ancestors Below - a more modern way of doing the same thing, looking through their DNA sequence for similarities
Learn about Natural Selection, see it happen first hand:
Above - a drawing of the famous Finches that Charles Darwin studied, he observed that species evolved to better suit their environment. In this case, the Finch's beak changed with its diet Below - the often disputed topic of human evolution, and the infamous depiction of it