Answer: D. The Demographic transition
Explanation: Demographic transition explains the association between population growth and economic development. It explains the high infant mortality and high birth rate associated with non-industrial, low technology and many developing countries and the low infant mortality, low birth rate commonly found in industrial, high technology and high level of education found in developed countries.
It is an historical overview which shows high birth rate in low industrial and developing countries and low birth rate in industrial and developed countries.
Dowager Empress Cixi was very fond of the Boxer Rebellion because she saw this as a chance for them to push the foreigners away. However it cause foreign attacks on Chinese forts.
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Population composition is the description of a population according to characteristics. These data are often compared over time using population pyramids.
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the blue colour is rickshaws