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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