Freshwater ecosystem is part of ponds, lakes, streams and rivers. i.e, option D is correct.
What is ecosystem?
Ecosystem, the complex of living organisms, their physical environment, and all their interrelationships in a particular unit of space.
Freshwater ecosystems are a subset of Earth's aquatic ecosystems. They include lakes, ponds, rivers, streams, springs, bogs, and wetlands. They can be contrasted with marine ecosystems, which have a larger salt content.
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