| 1 | The male sperm fertilizes the female egg. | |
| 2 | It takes only one sperm to fertilize the egg. | |
| 3 | Artificial insemination was a significant breakthrough in panda conservation. | |
| 4 | This made no sense. All the eggs are fertilized already. | |
| 5 | Medically, at least, fertilization does not mark the beginning of pregnancy. |
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