Evolution (which is studied in biology and anthropology) actually has several patterns that it follows. For example, one of the types of evolution that can happen to a species is divergent evolution. This type of evoluion is the kind of evolution that is most common and takes place when two similar species become increasingly differnt over a long period of time. Another type of evolution is convergent evolution. This evolution happens when species that come from various backgrounds begin to share similar characteristics over time. Another typeof evolution is parallel evolution. Parallel evolution takes place when two spcies evolve differently from one another and never gain similar characteristics.