<P> Population pyramids are often viewed as the most effective way to graphically depict the age and distribution of a population, partly because of the very clear image these pyramids represent . </P> <P> A great deal of information about the population broken down by age and sex can be read from a population pyramid, and this can shed light on the extent of development and other aspects of the population . A population pyramid also tells how many people of each age range live in the area . There tends to be more females than males in the older age groups, due to females' longer life expectancy . </P> <P> Population pyramid gives a clear picture of how a country transitions from high fertility to low fertility rate . The population pyramid here indicates stage 2 on the demographic transition . The broad base of the pyramid means the majority of population lies between ages 0--14, which tells us that the fertility rate of the country is high and above population sub-replacement fertility level . There is a higher dependency ratio of younger population over the working population . Moreover, there is lesser older population due to shorter life expectancy which is around 60 years . </P> <P> Each country will have different or unique population pyramids . However, most population pyramids will be defined as the following: Stationary, expansive, or constrictive . These types have been identified by the fertility and mortality rates of a country . </P>

Among which of the following categories of the u.s. population is fertility low