For domestic dogs that are raised by humans, there is still ____ despite the fact that this population of dogs doesn’t experience ____ the way wild animals do.

Evolution can still occur in domestic dogs because humans influence which dogs reproduce, even though they do not experience natural selection in the same way wild animals do. The sentence is completed by “evolution; natural selection,” choice A. The other choices pair terms that do not fit the contrast in the question; for example, a phylum is a broad taxonomic group, not a process dogs experience.

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