What are the motifs in The Red Queen: Sex and the Evolution of Human Nature by Matt Ridley?

Evolution as explanation is a recurring idea. Evolution is a scientific theory that explains the development of species and organisms over time. The key component of the theory of evolution is the understanding of the function of the gene and the methods that lead to gene replication. Evolution then is a scientific theory but also a powerful general method of explanation. Since we know that evolution is the only workable explanation for the development of organisms and traits, it is useful and warranted to presume that for any given trait, there is an evolutionary explanation or a biological history that explains the existence of the trait. This may not always be true. However, as an explanatory presumption, the idea is that evolution of some sort or other is the proper method of explanation unless it is proven otherwise.