species that are native to and found only within a limited area a species that could become endangered in the near future species whose population size is rapidly declining and will become extinct if the trend continues the branch of sociology that studies the characteristics of human populations countries with strong economies and a high quality of life Countries with weak economies and very high poverty

1. endemic species

species that are native to and found only within a limited area

2. threatened species

a species that could become endangered in the near future

3. endangered species

species whose population size is rapidly declining and will become extinct if the trend continues

4. demography

the branch of sociology that studies the characteristics of human populations

5. developed countries

countries with strong economies and a high quality of life

6. underdeveloped countries

Countries with weak economies and very high poverty.

7. LDC

A country that has low levels of average wealth, industrialization and modernization and often high levels of population growth and people employed in agriculture

8. age structure

proportion of people in different age groups in a population

9. survivorship

the percentage of members of a group that are likely to survive to any given age

10. immigration

Movement of individuals into an area occupied by an existing population