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| Marriage to one spouse at a time. | ———– |
| More than one partner at a given time. | ———– |
| One man has two or more wives at a time. | ———– |
| One woman marries more than one man at a given time. | ———– |

| inventions | ——– |
| Effects of earthquake | ——– |
| Declining sex ratio | ——– |
| Student exchange programme | ——- |
| Cultural diffusion | ——– |
| Materialism | ——– |




