MCQOPTIONS
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MCQOPTIONS
| 1. |
What amount of carbon is fixed in the biosphere through photosynthesis annually? |
| A. | 1013 kg |
| B. | 20 × 1020 kg |
| C. | 4 × 1013 kg |
| D. | 80 × 1035 kg |
| Answer» D. 80 × 1035 kg | |