According to jurmain et al macroevolution is changes

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species or population. According to Jurmain et al., Macroevolution is "Changes produced only after many generations, such as the appearance of a new species"(109). Speciation is the evolutionary process by which populations evolve to become distinct species. According to Jurm-ain et al., speciation is "The process by which a new species evolves from an earlier species. Speciation is the most basic process in macroevolution"(128). "Whether we’re talking about the short-term effects (as in our classroom population) from one generation to the next, which is sometimes called microevolution, or the long-term effects through time, called speciation or macroevolution, the basic evolutionary mechanisms are similar"(109). According to Britnee Smithers, "It is not surprising that some species can interbreed and others cannot because of the many different ways of reproduction. Each species has a way of reproducing offspring that will not be compatible with another species". she basically suggests that the reason why species cannot interbreed is due to the fact that their strategies of reproduction and the way they mate has been evolved to differentiate from one another. This is the concept of specification, that means mainly the inability of interbreed between two similar species is because of geographical isolation. Geographical isolation happens due to geographical barriers such as a big river dividing up two areas.as the result, population divides into two who lives in two separate geographic areas. when this happens the same species from each group doesn’t have a chance to have access to gene pool that they previously had. It is not surprisingly that after years of geographic isolation, specification occurs. the group of species evolve and mutate during generation and each adopt to their own environment which also has changed. The way species reproduce can change and evolve so they can adopt to their environment. Only the
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