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Assessment
What is the primary source of water for freshwater ecosystems?
Rainfall
Ocean tides
Groundwater
Glaciers
Which of the following is NOT a characteristic of freshwater ecosystems?
Low salt concentration
High biodiversity
Presence of coral reefs
Varied aquatic plants and animals
Which of the following is a major threat to freshwater ecosystems?
Overfishing
Deforestation
Pollution
Urbanization
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