Explain elaborately how the primary and tertiary sectors change as a country becomes more developed overtime. HELP

This map shows the member states of the european union (eu). based on this map, what is the most likely reason the eu was formed? a) to increase trade between european nations b) to protect themselves from foreign enemies c) to begin the process of forming one large nation d) to isolate europe from the rest of the international community j

All of the following occurred due to the invention of the railroad except

What are some of the impacts of humans on the earth?