 But for over thirty years, some participants in the “units of selection” debates have argued that more than one issue is at stake. The notions of “replicator” and “vehicle” were introduced, to stand for different roles in the evolutionary process (Dawkins 1978, 1982a,b). In this case, the individual deer would be called the “vehicles” and their genes that make them tend to be swifter would be called the “replicators.” The genic selection argument proceeded to assert that the units of selection debates should not be about vehicles, as they formerly had been, but about replicators. It was then asserted that the “replicator” actually subsumes two distinct functional roles, which can be broken up into “replicator” and “interactor”: 