ID theorists posit that living things, due to their organizational complexity and magnificent design, simply must be the creations of some form of intelligence. Where evolutionary biologists see species evolving through a blind process of natural selection acting over millions of years, ID theorists assert that life as we know it simply could not have arisen in such a manner. Furthermore, they claim that this is a scientific observation. ID advocates don't always articulate precisely what sort of intelligence they think should stand in lieu of evolution on textbook pages, but God -- defined in a very nebulous way -- generally outpolls extraterrestrials as the leading candidate.