What is a population pyramid?
a.-a key piece of information commonly included in special purpose maps
b.-a graphic that displays a country's population broken down by age group and gender
c.-an area of a map that indicates what certain symbols mean
d.-a graphic that displays the spatial distribution of earth's population

The correct answer is B. A population pyramid is a graphic that displays a country's population broken down by age group and gender.

Explanation:

A population pyramid is used to illustrate a population's age distribution, that is, how many people there are at different ages, and usually even by gender. The shape of a population pyramid can indicate whether there have been wars or disasters of an extent that have affected the population. For example, in the population pyramid of Germany there can be seen that something happened in the 1940s. This obviously depends on World War II.