Section: Human Geography

18) The shape of a country's population pyramid is determined primarily by its: 

1. crude birth rate
2. crude death rate
3. dependency rate
4. sex ratio

A population pyramid, also called an age pyramid or age picture diagram, is a graphical illustration that shows the distribution of various age groups in a population (typically that of a country or region of the world), which forms the shape of a pyramid when the population is growing.