| 1 | Indirect insemination, as in the flour beetle, provides a third possible adaptive advantage. | |
| 2 | But in 2006 there were only 307 new registrations and fewer women than ever are conceiving with a donor father. | |
| 3 | Egg freezing is still a relatively new technology, which enables a woman to save eggs for future IVF treatment if needed. | |
| 4 | Female roseate terns sometimes mate with each other for life, allowing themselves to be fertilised by males, but making nests and bringing up their young together. |
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