Anyone interested in learning how evolution works (or teaching it) should take a look at this game: "The challenge of a doublet is to turn one word into another. You are allowed to change one letter at a time, but each change must produce a real word. Here's a doublet that suits a post on evolution: Change APE to MAN.
Give up?
APE
APT
OPT
OAT
MAT
MAN"