The following sentences contain blanks. Use the drop-down menus to complete each blank correctly. Human migration means the long-term or permanent [Dropdown 1] of people. The act of leaving one’s home country is called [Dropdown 2] . The act of moving to a new country to live is called [Dropdown 3] . Sometimes, people move between places during different times of the year to work, find food, or avoid difficult weather conditions. This is called [Dropdown 4] .