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Ponds and rivers are two types of

• marine ecosystems
• rain forest biomes
• freshwater ecosystems
• estuary ecosystems

User Basudz
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2 Answers

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Freshwater ecosystems, because marine includes things more like the ocean depths, rain forests are FORESTS, and rivers and ponds have fresh water.
User Dan Lowe
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Ponds and rivers are two types of . . . . freshwater ecosystems
User Vik Santata
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