Much the most coherent explanation for the evolution of such phenomena is still Darwin's. Indeed, Darwin's proposal is much better seen as a theory about the origin of adaptations than as a theory about the origin of species.

DEFINE: Recasts the standard understanding of Darwinian theory, distinguishing the origin of adaptations from the origin of species as the theory's primary explanatory target.

Diego Gambetta, Trust - Making and Breaking…, loc. 262