what is reproductive isolating mechanism simplified

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Reproductive isolating mechanisms are barriers that prevent different species from interbreeding and producing viable offspring. These mechanisms can be prezygotic, meaning they prevent mating or fertilization from occurring, or postzygotic, meaning they prevent the formation of viable offspring after mating has taken place. Examples of reproductive isolating mechanisms include differences in mating behaviors, physical incompatibility, genetic incompatibility, and ecological isolation. These mechanisms help to maintain the genetic distinctiveness of different species and promote evolutionary divergence.