MCQOPTIONS
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MCQOPTIONS
| 1. |
What is the approximate amount of the annual net primary productivity of the whole biosphere? |
| A. | 80 million tons of organic matter |
| B. | 170 billion tons of organic matter |
| C. | 10 billion tons of organic matter |
| D. | 2 million tons of organic matter |
| Answer» C. 10 billion tons of organic matter | |