Which of following marine ecosystems have the highest mean net primary productivity?

Name: Which of following marine ecosystems have the highest mean net primary productivity?
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Question

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Kelp beds and reefs have the highest mean net primary productivity due to the high density of primary producers and the retention of nutrients in the ecosystem. The upwelling zones have high productivity but are seasonal, and the open oceans and continental shelves have lower productivity due to nutrient limitation.

Which of Following Marine Ecosystems Have the Highest Mean Net