The correct answer is option D. "moving from one country to another".
Explanation:
There are different types of migration depending on the geographical place where people move and for how long. External migration is defined as people moving from one country to another either permanently or for a long period of time. External migration is comprised of two concepts: emigration, which is the exit of people from their country and; immigration, which is the enter of people into another country.
There were several important factors that contributed to the ability of europeans to conquer the aztecs and inca, but the most important three were that the Europeans brought guns, germs, and steel weapons.
St. Paul refers to the people of the world as the "sons of Bondage". The Saints are children of God by adoption. He calls the Galatians back to Christ, so they can be saved.
