A bottom-heavy population pyramid indicates that a society has a large proportion of young people compared to older age groups. This type of demographic structure suggests that there will be a need for additional resources and infrastructure to accommodate the growing youth population as they age.
In this context, the most relevant implication is the need to add schools and teachers. As the population grows, especially among younger age groups, there will be an increasing demand for educational services to cater to these youth.
While there may also be future job needs (as these young people enter the workforce), the immediate focus due to the larger younger population would be on education. Therefore, the correct answer is:
The need to add schools and teachers.