Which Factor is Ultimately Responsible for the Rapid Population Explosion

Question

Which factor is ultimately responsible for the rapid population explosion of humans?  
A) More prevalence of microorganisms to fight diseases naturally
B) Increasing availability of natural resources
C) Decreasing migration of human and animal populations
D) Decline in death rates without an equivalent decline in birth rates
E) Advances in reproductive technology

Accepted Answer

The decline in death rates without an equivalent decline in birth rates, commonly known as the demographic transition, is ultimately responsible for the rapid population explosion of humans. As medical technology advanced, infant mortality rates decreased, and life expectancy increased, leading to a significant increase in the overall population.