| A | B |
|---|
| agricultural density | the ratio of the number of farmers to the total amount of arable land |
| arable land | land suited for agriculture |
| arithmetic density | the total number of people divided by the total land area |
| census | a complete enumeration of a population |
| crude birth rate | the total number of live births in a year for every 1,000 people alive in the society |
| ecumene | the portion of earth's surface occupied by permanent human settlement |
| physiological density | the number of people per unit area of arable land, which is land suitable for agriculture |
| epidemiology | the branch of medical science concerned with the incidence, distribution, and control diseases that are prevalent among a population at a special time and are produced by some special causes not generally present in the affected locality |
| population pyramid | a bar graph that represents the distribution of population by age and sex |
| zero population growth | a decline of the total fertility rate to the point where the natural increase rate equals zero |
