Final answer:
The growing demographic divide between countries is characterized by differences in birth rates, where developed countries have lower rates and developing countries have higher rates, a process explained by demographic transition.
Step-by-step explanation:
Demographers have noted a growing demographic divide between countries with low birth rates and those with higher rates. Developed countries usually experience low birth rates and low death rates, resulting in lower net population growth, while developing countries often have high death rates and higher birth rates, leading to higher net growth rates. This pattern is described by the concept of demographic transition, which outlines the stages countries go through from high birth and death rates to lower rates as they develop socioeconomically. Immigration and urbanization are other factors that influence demographic changes but are separate from the birth and death rate considerations.