1. Vocabulary Review Ch 19 Populations

2. A group of organisms of the same species that live in a specific geographical area and interbreed Population

3. The number of individuals of the same species that live in a given unit of area Population density

4. In ecology, the pattern of distribution of organisms in a population Dispersion

5. The number of births that occur in a period of time in a given area Birth rate

6. The number of deaths occurring in a period of time Death rate

7. The average length of time that an individual is expected to live Life expectancy

8. 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 Age structure

9. A graph of the mortality data of a population; indicates the probability that individuals will survive to any given age Survivorship curve

10. An expression of the increase in the size of an organism or population over a given period of time Growth rate

11. The movement of an individual or group into an area Immigration

12. The movement of an individual or group out of an area Emigration

13. A model of population growth in which a constant and unlimited growth rate results in geometric increases in population size Exponential model

14. An environmental factor that prevents an organism or population from reaching its full potential of distribution or activity Limiting factor

15. A model of population growth that assumes that finite resource levels limit population growth Logistic model

16. The largest population that an environment can support at any given time Carrying capacity

17. A variable that affects a population regardless of the population density, such as climate Density- independent factor

18. A variable affected by the number of organisms present in a given area Density- dependent factor

19. The crossing or mating of plants or animals with close relatives Inbreeding

20. A way of life in which people obtain their food by hunting and gathering wild animals and plants Hunter-gatherer lifestyle

21. The change from a hunting and gathering society to an agricultural society that began about 10,000 years ago Agricultural revolution

22. A modern, industrialized country in which people are generally better educated and healthier and live longer than people in developing countries do Developed country

23. A country in which the society is less modern and less industrialized and in which inhabitants are generally poorer than they are in developed countries Developing country

24. The general pattern of demographic change from high birth and death rates to low birth and death rates, as observed in the history of more-developed countries Demographic transition