Final answer:
The stationary population pyramid has low birth and death rates, long life expectancy, and a stable population, typically representing a developed country in Stage 4 of the demographic transition.
Step-by-step explanation:
A large base in a population pyramid represents a high number of young individuals in the population. This indicates a high birth rate and a growing population. The wide base reflects a large number of children and a lower proportion of older adults.
The stationary population pyramid is the one described as having low birth and death rates, a long-life expectancy, and a stable population size. This type of pyramid typically characterizes a developed country that has gone through a demographic transition, reaching Stage 4, where both birth and death rates are low, and the population growth has slowed to zero.
A stationary pyramid generally shows an even distribution among different age groups, indicating that the population is replacing itself without significant growth or decline.