Final answer:
Coral reefs have the highest productivity among aquatic ecosystems due to their biodiversity and ecological functions.
Explanation:
Coral reefs have the highest productivity among aquatic ecosystems. These diverse marine ecosystems support a wide array of species, making them highly productive in terms of biodiversity and ecological functions.
Open oceans, swamps, and wetlands, and lakes and streams also have their own unique characteristics and levels of productivity, but coral reefs stand out as the most productive aquatic ecosystems.
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