 One possible response against regarding the classical approach to evolution by natural selection as unconditionally superior to the replicator/interactor approach is to argue that although evolution by natural selection can occur without replication, when this happens, the evolutionary change resulting is not a pure case of evolution by natural selection. Rather, it is evolution by natural selection mixed with some other evolutionary processes. A rationale for this claim is that the fact that offspring do not resemble their parent introduces some variation into the population of which the origin is not natural selection. In abstract terms, the introduction of variation can be regarded as a form of mutation (Bourrat 2019). Under this interpretation, the classical approach, on the one hand, and the replicator/interactor approach, on the other hand, simply emphasize different aspects of evolutionary explanations. The classical approach gives us evolutionary explanations in the context of other evolutionary processes occurring, while the replicator/interactor approach gives us evolutionary explanations of what the effect of natural selection would be in the absence of any other evolutionary process acting in the population—that is, in its pure form. Understood that way, the two approaches do not necessarily need to be opposed.