| A | B |
| Population Density | The number of individuals in a specific area. |
| estimate | An approximation of a number based on reasonable assumptions. |
| birth rate | The number of births in a population in a certain amount of time. |
| death rate | The number of deaths in a ppopulaiton in a certain amount of time |
| immigration | Moving into a population. |
| emigration | Leaving a population |
| limiting factor | An environmental factor that prevents a population from increasing. |
| carrying capacity | The largest population that an area can support. |