Section outline

  • THEMATIC FOCUS

    Humans and the Environments ENV
    The environment shapes human societies, and as populations grow and change, these populations in turn shape their environments.

    LEARNING OBJECTIVE

    Unit 9: Learning Objective B
    Explain how environmental factors affected human populations over time.

    HISTORICAL DEVELOPMENTS

    KC-6.1.III
    Diseases, as well as medical and scientific developments, had significant effects on populations around the world.

    KC-6.1.III.A
    Diseases associated with poverty persisted while other diseases emerged as new epidemics and threats to human populations, in some cases leading to social disruption. These outbreaks spurred technological and medical advances. Some diseases occurred at higher incidence merely because of increased longevity.

    • Topic 9.2 Lesson Content File PDF

      Download and use this document for this lesson. 

    • Topic 9.2 Lesson Video

      Watch this video for this lesson.

       

       

    • Topic 9.2 MCQs Quiz
      Opened: Monday, 27 April 2026, 12:26 PM

      There are 25 questions in this exercise. Try to complete them within 8 minutes.

    • Topic 9.2 SAQ Practice Assignment
      Opened: Monday, 27 April 2026, 11:15 AM

      SAQ Set 1 (Stimulus-Based — Medical Advances)

      Stimulus:
      “Vaccines and antibiotics dramatically reduced mortality rates in the 20th century, allowing populations to grow and live longer lives.”

      A. Identify ONE example of a medical innovation that supports this statement.
      B. Explain ONE effect of this innovation on human populations.
      C. Explain ONE limitation of medical advances in reducing disease globally.

       

      SAQ Set 2 (Stimulus-Based — Disease & Poverty)

      Stimulus:
      “Diseases associated with poverty continued to affect large populations despite advances in medical technology.”

      A. Identify ONE disease associated with poverty.
      B. Explain ONE reason this disease persisted.
      C. Explain ONE broader social or economic effect of this disease.

       

      SAQ Set 3 (Non-Stimulus — Environmental Change)

      Skill Focus: Causation

      A. Identify ONE environmental factor that contributed to the spread of disease after 1900.
      B. Explain ONE way this factor affected disease transmission.
      C. Explain ONE effect of increased life expectancy on disease patterns.