Both the highlands and lowlands were important to the president of trade within the mayans civilization

It is true

The lowlands were mainly produced crops that are used to fulfill daily consumption , and the highland got a huge amount of natural resources such as metal and jade

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]