For those without Microsoft Ofiice. I suggest using LibreOffice to open powerpoint files. It's free. It's Open Source. It works.
Attached is some extra Reinforcement for Population Pyramids. If your a little rusty and want to study, It is a good place to start.
Attached is the Powerpoint concerning Migration & Immigration. Immigration&Migration
Attached is the Powerpoint concerning Population from class. Population
Attached is the latest Powerpoint concerning the Human Developmental Index Lesson from class. Human Developmental Index