““In the course of life, all such systems (i.e., the different evolutionary ridges) are somewhat functionally interdependent, as are components within each system (i.e., the different programs, schema, modules). Nevertheless, each system and system component has a somewhat distinct evolutionary history and time line. There is no single origin of religion, nor any necessary and sufficient set of functions that religion serves. Rather, there is a family of evolutionary-compatible functions that all societies more or less realize but that no one society need realize in full. Religions””
