MCQOPTIONS
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MCQOPTIONS
| 1. |
The first anaerobic photoautotrophs originated--- million years ago |
| A. | 1000-2000 |
| B. | 3300-3500 |
| C. | 3600-4200 |
| D. | 4000-4200 |
| Answer» D. 4000-4200 | |