| population density | | |
| high population density | | |
| low population density | | |
| low population density | | |
| regulation of population growth | | |
| the most populated country | | |
| What are the basic life conditions? | | |
| gender | | |
| life conditions on the arth | | |
| decrease of population | | |
| The size of population is influenced by the amount of food. | | |
| The population increases if birth rate prevails over mortality. | | |
| age | | |