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Which of the following statements about aquatic ecosystems IS correct?

Rivers and streams are flowing salt water ecosystems

Marine ecosystems are standing freshwater ecosystems

Ponds and lakes are flowing-water ecosystems

Estuaries are made of both fresh and salt water, where rivers meet the sea.

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leahtgarland
Hey! I think the correct answer would be the last one! Estuaries are where fresh water from rivers and streams mixed with salt water

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