Source: Population Pyramids Public Domain http://en.wikipedia.org/wiki/File:DTM_Pyramids.svg
A theory of population growth that argues that population growth varies as society progresses technologically.
A theory of population growth that argues that rapid population growth increases would outpace food production leading to social chaos.
This pyramid graphically represents a population broken down by age and sex.
A way to express the number of males relative to the number of females in a population.