The selva is what kind of region
a; flat and marshy
b: mountainous and snowy
c: forest and tropical
d: barren and dry

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]

c. seafloor spreading occurs.

d. crust becomes molten rock.

e. denser plates slide under lighter plates.