Population Pyramids

Today in class we got our test back and I actually didn't do that bad. I definitely think I could have done better but I didn't do bad. I definitely think I was prepared for this test and I'm happy with my grade. We also started taking notes on Population Pyramids while Charlotte took her test. Here are some of the notes I took. Population Pyramids are split between the two sexes and range from ages 0-100+. Population Pyramids help predict future trends in population but also past population as well. As a  country moves from a preindustrial to a post industrial economy, the life expectancy decreases.