1. Adolescents are generally grouped in the age group of 10 to 19 years.

    Adolescents are generally grouped in the age group of 10 to 19 years.

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  2. The substantial improvement is the result of many factors including improvement in public health, prevention of fatal diseases and application of medical practices in diagnosis and treatment of ailments.

    The substantial improvement is the result of many factors including improvement in public health, prevention of fatal diseases and application of medical practices in diagnosis and treatment of ailments.

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    • 6
  3. Developed nations have a high proportion of people in secondary and tertiary activities, whereas developing countries tend to have a higher proportion of their workforce engaged in primary activities.

    Developed nations have a high proportion of people in secondary and tertiary activities, whereas developing countries tend to have a higher proportion of their workforce engaged in primary activities.

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  4. Tertiary activities include transport, communications, commerce, administration, and office services.

    Tertiary activities include transport, communications, commerce, administration, and office services.

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  5. Secondary activities include manufacturing industry, building and construction work, etc.

    Secondary activities include manufacturing industry, building and construction
    work, etc.

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    • 5