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The NPP of whole biosphere is ul(A) out ...

The NPP of whole biosphere is `ul(A)` out of which NPP of oceans is `ul(B)`.

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**Step-by-Step Solution:** 1. **Understanding NPP (Net Primary Productivity)**: - NPP is defined as the amount of biomass available for consumption by heterotrophs (organisms that cannot produce their own food, such as herbivores and decomposers). It represents the net gain in biomass after accounting for the energy used in respiration by plants. 2. **NPP of the Whole Biosphere**: - The total NPP of the entire biosphere is given as `A = 170 billion tons` of organic matter (dry weight). This figure represents the total biomass produced by all ecosystems on Earth. 3. **NPP of Oceans**: - The NPP of the oceans is a subset of the total biosphere NPP. It is specified that the NPP of the oceans is `B = 55 billion tons` of organic matter (dry weight). This indicates the productivity specifically from marine ecosystems. 4. **Comparison of NPP**: - To summarize, we have: - Total NPP of the biosphere (A) = 170 billion tons - NPP of the oceans (B) = 55 billion tons 5. **Conclusion**: - Thus, the values for the NPP of the biosphere and oceans are: - A = 170 billion tons - B = 55 billion tons
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ALLEN-ECOLOGY-Question
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  4. Discuss the main reason for the low productivity of ocean.

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