MCQOPTIONS
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| 1. |
Which of the following is not involved in the continuous water exchange? 1. Stones 2. Air 3. Land 4. Sea Choose the correct code |
| A. | 1 only |
| B. | 2 only |
| C. | 1 and 2 |
| D. | 3 and 4 |
| Answer» B. 2 only | |