| A | B |
|---|
| geographic distribution of a population | range |
| shows the average number of organisms in an area | density |
| two factors that increase the size of a population | births and immigration |
| two factors that decrease the size of a population | deaths and emigration |
| growth rate that requires unlimited resources | exponential |
| growth rate when resources are limited | logistic |
| growth rate with a J-shape | exponential |
| growth rate with an S-shape | logistic |
| greatest size of a population that can be supported by an ecosystem | carrying capacity |
| limits to growth affected by the size of the population | density-dependent |
| limits to growth NOT affected by the size of the population | density-independent |
| current estimate of the world's human population | 7.1 billion |
| estimate of the world's human population in 2025 | 7.8 billion |
| estimate of the world's human population in 2050 | 9 billion |
