Population Pyramids Video

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Today in class we finished going over the rest of the test. After that, we watched a video about population pyramids. In population pyramids, the data is divided by gender; men are on the left and women are on the right. The pyramid is shown in five-year intervals and starts with ages 0-4 and ends with 100+. There are three groups inside the population pyramid. The first group is the pre-reproductive group, containing ages 0-14. The second group is the reproductive group, containing ages 15-44. The third group is the post-reproductive group, containing ages 45-100+. We also discussed how population pyramids can predict the future. We learned that if a population pyramid has a large base and looks like a triangle, the population of that country is growing rapidly. However, if the pyramid has a small base and more people in the reproductive and post-reproductive group, the population of a specific country is increasing very slowly or is decreasing. Below is a population pyramid of the United States. 

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