What were some of the advancements that happened during the Pax Romana

- There were huge leaps in engineering, to construct more sturdy roads more efficiently to support the huge empire in transporting materials.

- Architecture. To show the glory of the Pax Romana, and to improve the lives of citizens, huge structures like the Colosseum and Pantheon, along with public baths and basilicas, were built. This required leaps in architecture, and they still stand to this day.

- Military System. To properly defend the huge empire, the Romans managed to set up military outposts and systems of networks across the empire to transport soldiers quickly and set up quick communications. This system has greatly affected military systems later.

Explanation:

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d. stage 4

explanation:

the existence of some kind of demographic transition is widely accepted in the social sciences because of the well-established historical correlation linking dropping fertility to social and economic development.[1] scholars debate whether industrialization and higher incomes lead to lower population, or whether lower populations lead to industrialization and higher incomes. scholars also debate to what extent various proposed and sometimes inter-related factors such as higher per capita income,lower mortality, old-age security, and rise of demand for human capital are involved.[2]