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A variety of ecosystems are spread across the world, each with distinctive interacting characteristics and components. They range from small (eg a freshwater pond) to global (eg the desert biome).

Human activity can impact on ecosystems. One such ecosystem, the tropical rainforest, faces threats which need to be managed to ensure its survival.

Hot deserts are an important ecosystem with distinct characteristics and adaptations. They provide opportunities for development but also face challenges such as desertification.