Question

34 the primary reason that the human population has grown rapidly over the past 100 years is that there has been
a more access to renewable resources.
b an increase in food supplies and better access to clean water.
c a decrease in cancer rates due to scientific research.
d more access to light and electricity.

Explanation:

To determine the primary reason for rapid human population growth over the past 100 years, we analyze each option:

• Option A: While renewable resources are important, access to them isn't the primary driver of population growth.
• Option B: Increased food supplies (reducing starvation) and better access to clean water (improving health and reducing water - borne diseases) directly impact survival rates and overall health, which are key factors in population growth.
• Option C: A decrease in cancer rates affects a specific disease and is not the primary driver of overall population growth over a century, as cancer is not the main cause of mortality limiting population growth historically.
• Option D: Access to light and electricity improves quality of life but is not a direct cause of population growth like food and clean water are.

Answer:

B. an increase in food supplies and better access to clean water.