character: Sand Dunes
topic: Role in Biodiversity and Ecosystem Services
subject: Geography
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character: Coastal Ecosystems
topic: Impact of Sand Dunes on Marine Life
subject: Geography
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character: Desert Ecosystems
topic: Sand Dunes and Unique Flora and Fauna
subject: Geography
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character: Ecosystem Services
topic: Protection and Habitat Provision by Sand Dunes
subject: Geography
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