MCQOPTIONS
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MCQOPTIONS
| 1. |
The thickness of biosphere is$? |
| A. | 8-10 km above the earth's surface |
| B. | 5-8 km above the earth's surface |
| C. | 5-10 km above the earth's surface |
| D. | 10-12 km above the earth's surface |
| Answer» B. 5-8 km above the earth's surface | |