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Consider the following two statements:

l. The annual net primary productivity of the whole biosphere is approximately 170 billion tons (dry weight) of organic matter.

ll. Majority of this is contributed by the oceans as they occupy larger area of earth.

1. Both l and ll are correct and ll explains l
2. Both l and ll are correct but ll does not explain l
3. l is correct but ll is incorrect
4. l is incorrect but ll is correct