Question
How is fertilisation by a self-incompatible pollen prevented?
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| Era | Dominating group of animals |
| 1. Coenozoic | ………………………………. |
| 2. ………………………………. | Reptiles |
| 3. Palaeozoic | ………………………………. |
| 4. ………………………………. | Lower Invertebrates |