population pyramids

~ Russia and Nigeria have about the same population even though Russia is much bigger

~ Nigeria's population is growing and Russia's population is falling

~ on population pyramid, men are on the left women are on the left

~ youngest at the bottom/oldest on top

~ data is recorded in 5 year increments

3 different groups:
1. pre-productive age (0-14)
2. reproductive age (15-44)
3. post reproductive age (45-death)




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