The Human Population

Demography
the study of the characteristics of human populations

Age structure
the distribution of ages in a specific population at a certain time

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

Fertility rate
the number of babies born each year per 1,000 women in a population

Migration
the movement of individuals from one population into another

life expectancy
the average number of years a person is expected to live

demographic transition
is a model that describes how economic and social changes affect population growth rates.

infrastructure
the basic facilities and services that support a community

arable land
land that can be used to grow crops

urbanization
Movement of people from rural areas to cities

least developed countries
Countries that have been identified by the United Nations as showing the fewest signs of development in terms of income, human resources, and economic diversification.