Irreducible complexity: A concept used by proponents of Intelligent Design and Young Earth Creationism (YEC) to argue that complex organisms could not have evolved gradually from more primitive forms, because they need all their interacting parts to function. If you remove one part, the other parts will cease to function. Therefore, the organism could not have started with fewer parts. It needs all parts all at once in order to function. The only way an organism can exist, they argue, is if God created it as a complete organism. According to Answers in Genesis and other Intelligent Design proponents, the following examples can be used to “prove” that evolution isn’t…