MCQOPTIONS
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| 1. |
The total number of extant species is approximately.. |
| A. | 1,000 to 50,000. |
| B. | 50,000 to 150,000. |
| C. | 500,000 to 1,000,000. |
| D. | 10,000,000 to 80,000,000. |
| Answer» E. | |