| A | B |
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| Population | a group of organisms of the same species that live ina specific geographical area and interbreed |
| Inbreeding | the crossing or mating of plants or animals with close relatives |
| Exponential model | a model of population growth in which a constant and unlimited growth rate results in geometric increases in population size |
| Emigration | the movement of an individual or group out of an area |
| Immigration | the movement of an individual or group into an area |
| Birth Rate | the number of births that occur ina period of time in a given area |
| Growth Rate | An expression of the increase in the size of an orgainsm or population over a given period of time |
| Population Density | the number of individuals of the same species that live in a given unit of area |
| Density-dependent Factor | a variable affected by the number of organisms in a population |
| Survivorship Curve | a graph of the mortality data of a population |
| Dispersion | the pattern of distrubution of organisms in a population |
| Density-independent Factor | a variable that affects a population regardless of the population density, such as climate |
| Carrying Capacity | the largest population that an environment can support at any given time |
| Age Structure | the classification of members of a population into groups according to age or the distribution of members of a population in terms of age groups |
| Hunter-gatherer Lifestyle | a way of life in wich people obtain their food by hunting and gathering wild animals and plants |
| Limiting Factor | an environmental factor that prevents an orgainism or population from reachng its full potential of distribution or activity |
| Death Rate | the number of deaths occurring in a period of time |
| Developing Country | a country in which the society is less modern and liss industrialized and in which inhabitants are generally poorer |
| Logisitic Model | a model of population growth that assumes that finity resource levels limit population growth |
| Developed Country | a modern, industrialized country in which people are generally better deucated and healthier and live longer |
| Life Expectancy | the average length of time that an individual is expected to live |
| Demographic Transition | the general patter of demographic change from high birth and death rates to low birth and death rates |
| Agricultural Revolution | the change froma hunting and gathering society to an agricultural society that began about 10,000 years ago |
