Final answer:
Populations dominated by juveniles should experience rapid growth due to a larger proportion of the population being at or nearing reproductive age, which significantly influences population dynamics and future growth.
Step-by-step explanation:
An example of an age-structure influence on human population size is that populations dominated by juveniles should experience rapid growth. This occurs because a larger proportion of the population is, or will soon be, at reproductive age compared to populations with fewer juveniles. The age-sex structure, which represents the number of individuals of each sex and age in the population, is significant for understanding population dynamics and future growth patterns.
Countries with a high percentage of young people often experience rapid population growth. This pattern is prevalent in underdeveloped countries with high birth rates and where individuals often do not live to old age due to challenging living conditions. Conversely, developed countries with more older individuals and fewer young ones may have slower or zero population growth.