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Which one of the following is the correct sequence of ecosYstems in the order of decreasing productivity?

Which one of the following is the correct sequence of ecosYstems in the order of decreasing productivity?
(a) Oceans, lakes, grasslands,mangroves
(b) Mangroves, oceans, grasslands,lakes
(c) Mangroves, grasslands, lakes,oceans
(d)Oceans, mangroves, lakes,grasslands

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