ZoologyThe annual net primary productivity of the oceans is about

The annual net primary productivity of the oceans is about

  1. A

    70 billion tons.

  2. B

    55 billion tons.

  3. C

    170 billion tons.

  4. D

    55 million tons.

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    Solution:

    The productivity of the oceans is 55 billion tons.

    The annual net primary productivity of the whole biosphere is approximately 170 billion tons (dry weight) of organic matter. Of this, despite occupying about 70 per cent of the surface, the productivity of the oceans is only 55 billion tons.

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