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In 2025, Japan is projected to have the highest life expectancy, at around 84.8 years, followed by Canada at 81.57 years. Eritrea, in contrast, is expected to have a significantly lower life expectancy, with an average of around 68.3 years.

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The average period of time the person may expect to live.

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The number of births per thousand per year.

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The amount of people in a country are not of working age compared with those of working age.

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Douglas, R. J. W. (1969b). Geological map of Canada. https://doi.org/10.4095/108937

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MAP 12 Djibouti, Eritrea and Ethiopia. (2006). In Elsevier eBooks (p. i). https://doi.org/10.1016/b0-08-044854-2/09212-9

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Imai, N., Terashima, S., Okai, T., Kanai, Y., Mikoshiba, M., Ohta, A., Tachibana, Y., Kamioka, H., Togashi, S., & Matsuhisa, Y. (2003b). Geochemical Map of Japan. Geochimica Et Cosmochimica Acta Supplement, 67(18), 170. http://ui.adsabs.harvard.edu/abs/2003GeCAS..67R.170I/abstract

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In 2025, Canada, Eritrea, and Japan exhibit significantly different birth rates, with Eritrea having a much higher rate compared to Canada and Japan. Canada's fertility rate is nearing Japan's lower end, while Eritrea maintains a higher rate around 28 births per 1,000 inhabitants.

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In 2025, Japan is projected to have the highest dependency load among the three countries, followed by Canada, and then Eritrea. Japan's high ratio is primarily due to its aging population, while Eritrea's likely has a higher dependency load than Canada due to its younger population and high fertility rates. Canada has a moderate dependency load, with a balance between its youth and older populations.

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Differences in life expectancy, birth rates, and dependency load across Canada are influenced by a complex mix of factors, including socioeconomic conditions, access to healthcare, regional variations, and immigration patterns.

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Differences in life expectancy, birth rate, and dependency load in Eritrea exist due to a complex interplay of factors including poverty, conflict, healthcare access, and cultural practices. These factors influence mortality rates, fertility rates, and the ratio of dependents to working-age individuals, creating regional disparities.

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Japan experiences differences in life expectancy, birth rates, and dependency load due to a combination of factors, including its successful healthcare system, low birth rates stemming from societal and economic pressures, and a long-lived population.

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It is important/useful because you can end up seeing the difference of life expectancy, birth rate, and dependency load that changes throughout the years in each different countries. (that's all i can think of 😬)