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This is a sentence copied from an article on Wikipedia, called "Ecotone", to add references and more information to with proper citation for an assignment.

Citation of the second sentence: First, an ecotone can have a sharp vegetation transition, with a distinct line between two communities.

taken from: https://en.wikipedia.org/wiki/Ecotone

Addition of a cited sentence: Features[edit source] There are several distinguishing features of an ecotone. First, an ecotone can have a sharp vegetation transition, with a distinct line between two communities [4]. For example, a change in colors of grasses or plant life can indicate an ecotone. Second, a change in physiognomy (physical appearance of a plant species) can be a key indicator. Water bodies, such as estuaries, can also have a region of transition, and the boundary is characterized by the differences in heights of the macrophytes or plant species present in the areas because this distinguishes the two areas' accessibility to light. Scientists look at color variations and changes in plant height. Third, a change of species can signal an ecotone. There will be specific organisms on one side of an ecotone or the other.

taken from: https://en.wikipedia.org/wiki/Ecotone