Factors that effect human population size
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| 7100155935 | Age structure diagram | Horizontal bar graph of a population divided into groups by age and gender. |  | 0 |
| 7100155936 | Birth rate | The rate at which births occur in a population, measured as the percentage of births compared with the total population in a year. | 1 | |
| 7100155937 | Death rate | The rate at which deaths occur in a population, measured as the percentage of a population dying compared with the total population in a year. | 2 | |
| 7100155938 | Demographic transition | The pattern of change in birth and death rates as a country is transformed from undeveloped to developed. |  | 3 |
| 7100155939 | Growth rate | The net increase of some factor per unit time. It is sometimes measured as the increase in numbers of individuals or biomass per unit time and sometimes as a percentage increase in numbers or biomass per unit time. | 4 | |
| 7100155940 | Human carrying capacity | The maximum number of human beings which can live on Earth at the same time; is dependent on the quality of life people desire and are willing to accept | 5 | |
| 7100155941 | Life expectancy | The estimated average number of years (or other time period used as a measure) that an individual of a specific age can expect to live | 6 | |
| 7100155942 | Zero population growth (ZPG) | The number of births equals the number of deaths so that there is no net change in the size of the population | 7 | |
| 7100155943 | Demography | The study of populations, especially their patterns in space and time | 8 | |
| 7100155944 | Replacement level fertility | Fertility rate required for a population to remain a constant level | 9 | |
| 7100155945 | Total fertility rate (TFR) | The average number of children expected to be born to a woman during her lifetime | 10 | |
| 7100155946 | Crude birth rate | The number of live births per 1,000 people in a population, in a given year. | 11 | |
| 7100155947 | Crude death rate | The number of deaths per 1,000 people in a population, in a given year. | 12 | |
| 7100155948 | Infant mortality rate (IMR) | The number of deaths of infants under 1 year old per 1,000 live births. | 13 |
