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Natural selection might explain microevolution, but it cannot explain the origin of new species and higher orders of life.

Evolutionary biologists have written extensively about how natural selection could produce new species. For instance, in the model called allopatry; if a population of organisms were isolated from the rest of its species by geographical boundaries it might be subjected to different selective pressures. Changes would 'accumulate' in the isolated population. If those changes became so significant that the splinter group could not or routinely would not breed with the original group, then the splinter group would be reproductively isolated and on its way toward becoming a new species.