Respuesta :

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Answer:

see below :)

Explanation:

There are three types of ecosystems; freshwater, ocean, and terrestrial.

NinjaJaxx
431 because....

A total of 431 World Ecosystems were identified, and of these a total of 278 units were natural or semi-natural vegetation/environment combinations, including different kinds of forestlands, shrublands, grasslands, bare areas, and ice/snow regions.