Population Pyramids pt. 2

Today in class we finished reviewing our test. After that Mr. Schick put on a TedEd video about population pyramids. We learned that population pyramids are split by se and age: men always being on the left and women always being on the right. The pyramids are grouped by the pre-reproductive (0-14), reproductive (15-44), and post-reproductive (45+). As a country moves from pre-industrial society to a post-industries economy, the life expectancy increases.When birth and death rates are both low, the population remains stable.