NEET BiologyClass 12ProductivityHardSingle correct

The biosphere's annual net primary productivity is about 170 billion tons (dry weight), of which the oceans, which cover about 70 per cent of the earth's surface, contribute about 55 billion tons. Roughly what share of global NPP is oceanic?

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The biosphere's annual net primary productivity is about 170 billion tons (dry weight), of which the oceans, which cover about 70 per cent of the earth's surface, contribute about 55 billion tons. Roughly what share of global NPP is oceanic?

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