The ural mountains mark the traditional boundary between

The Ural mountain marks the traditional boundary between European Russia and Asia Russia

Explanation:

The Ural mountain are old and worn out with an average height of 610m,the Ural mountain is rich in iron ore and mineral gas like methane

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]

99%

explanation: