Supporters of intelligent design argue that anything less than the complete form of such a system or organ would not work at all, or would in fact be a "detriment" to the organism, and would therefore never survive the process of natural selection. Although they accept that some complex systems and organs "can" be explained by evolution, they claim that organs and biological features which are "irreducibly complex" cannot be explained by current models, and that an intelligent designer must have created life or guided its evolution. Accordingly, the debate on irreducible complexity concerns two questions: whether irreducible complexity can be found in nature, and what significance it would have if it did exist in nature.