primary sector, farming, mining jobs, secondary sector, factories and Construction, tertiary sector, jobs like banking, teaching, quaternary sector, finance, IT, technology , population pyramid, age and gender structure of population, dependency ratio, proportion of people young and old who depend on working class .

development models, population

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تضمين

لوحة الصدارة

النمط البصري

الخيارات

تبديل القالب

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