Which of the following factors has significantly contributed to the increase in global population?

• A. Decreased urbanization
• B. Increased birth rates only
• C. Improved sanitation and health care
• D. Limited agricultural advancements

Answer: (C)

The significant increase in the global population can be largely attributed to improved sanitation and healthcare. Throughout history, advancements in sanitation practices and healthcare have led to a reduction in mortality rates, particularly infant mortality. Access to clean water, proper waste disposal, vaccination programs, and medical care has allowed people to live longer and healthier lives, which in turn has contributed to population growth.

When sanitation and healthcare improve, communities experience lower disease prevalence and higher life expectancy. As a result, families are less likely to lose children to preventable diseases, and overall population numbers rise. This phenomenon is also linked to the demographic transition model, where countries shift from high birth and death rates to lower birth and death rates as they develop economically and socially.

In contrast, decreased urbanization would generally imply migration away from cities, which is not typically associated with population growth. Increased birth rates alone, while contributing to population increases, do not account for improvements in mortality rates that significantly impact overall population dynamics. Limited agricultural advancements would likely result in food shortages and poor nutrition, ultimately hindering population growth rather than supporting it. Thus, improved sanitation and healthcare remains a key factor in the significant growth of the global population.