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Which type of ecosystem accounts for most of the net primary productivity on earth even though it has a low average net primary productivity?

(a) Tropical rain forest

(b) Desert

(c) Tropical evergreen forest

(d) Oceans

I got this question in an online quiz.

My enquiry is from Structure and Functions of an Ecosystem topic in chapter Ecosystems of Energy Management

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The correct option is (d) Oceans

To explain I would say: The open oceans account for most of the net primary productivity on the planet even though they have one of the lowest average net primary productivities which cover by far the most area on earth.

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