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Differentiate between an 'Expanding age pyramid' and a 'Stable age pyramid'. Substantiate your answer with diagrams. 

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Expanding Stable
This type of graph has a triangular shape, with a very wide base and pointed apex.  This type of population distribution shows a rectangular or squarish shape, with almost the same number of people in all age groups.
Each age group shows a bar less wider than that of the age group before it, indicating that more people die at each higher group.  There is a slight taper at the top, which is perfectly natural, due to more deaths occurring among the elderly.
The large base shows a high birth rate, which is probably due to factors like a developing economy, poverty, low levels of female education, and less awareness of birth control measures.  Such countries have a high life expectancy, where more people live to a ripe old age, due to better living conditions, medical facilities, and geriatric care. 
Post-reproductive
Reproductive
Pre-reproductive
Post-reproductive
Reproductive
Pre-reproductive

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