By conbining one organism with another. A new specie formed when a population is isolated.When a group of individuals is separated from the rest of their species for a long time, the individuals can evolve different traits. The longer the group is isolated from the rest of the species, the more likely it will evolve into a new species. Almost every lake has different forms, believed to have evolved from one species.Groups of living things can become separated in different ways. Rivers can change their course. Volcanoes and mountain ranges form. New islands are created. Ocean waves can carry small groups many miles away and put them down in a new place.
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