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Ecotones are the transitional zones between two ecosystem.

Explanation:

Ecotones is a narrow zone between two different ecosystem.

It may be defined as the transition zone between these two ecosystem. Ecotones are species rich and it's resources are used by inhabitants of both the ecosystem.

Ecotones are marked by sharp changes in vegetation and species population.

The ecotones arise due the drastic changes in the environmental condition of a place that creates a sharp boundary between it and adjacent area.

However, these changes blend somewhere in between these  area and results in formation of ecotones.

Example of ecotones can be the mangroves. These lie between marine ecosystem and terrestrial ecosystem.

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