Anyone knows what a flagellum is? Look at the picture below. It is like a whip-like structure that propels some type of bacteria around. According to the proponents of intelligent design, a flagellum is proof of a creator as according to them if you remove one piece of the structure them it is rendered useless. So how can this have evolved? But again, when it comes to reality, intelligent design is always in the wrong. Scientists have discovered a bacteria with a structure very similar to the flagellum but with many missing parts and the structure has a function! It is used by bacteria to inject toxin in its hosts. This basically destroyed the irreducible complexity theory so love by Intelligent design proponent.