>>13169870Read "Darwin's Black Box" by Michael Behe. He argues in favor of the idea of irreducible complexity, the idea that there are mechanisms which can't be explained by our current understanding of evolution. Basically, a mechanism that if you change one part, it doesn't work at all, and since evolution works slowly, piecemeal, it couldn't possibly explain how everything developed.
Pretty interesting. Not an argument that evolution is wrong, but leaves the door open for intelligent design.
ATP synthase definitely isn't an example of this. It seems to have been two separate things that once they translocated together genetically worked way better. The fact that it resembles several other proteins suggests that one protein likely had evolutionary forks.