What are three different shapes of population pyramids?

The three types of population pyramids are as follows: 1. Expansive Population Pyramids: These pyramids show a large number of young people with high fertility rates, such as many third-world countries; 2. Constructive Population Pyramids: These pyramids show a lower percentage of young people with declining birth rates, such as the USA; 3. Stationary Population Pyramids: These pyramids show an equal population of both young and old people with neither increasing nor decreasing, but stable, such as Australia. Thank you.

The three different shapes of population pyramids are:

1. Expansive pyramid: Wide base, indicating a high birth rate and a large proportion of young people.
2. Constrictive pyramid: Narrow base, indicating a low birth rate and a smaller proportion of young people compared to older age groups.
3. Stationary pyramid: Rectangular shape, indicating a relatively stable population with consistent proportions across age groups.

The three different shapes of population pyramids are:

1. Expansive (or pyramid-shaped) population pyramid
2. Constrictive (or inverted pyramid) population pyramid
3. Stationary (or column-shaped) population pyramid