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refugees
Border Patrol.
People become refugees in Afghanistan because of instability in their home areas. The instability is usually due to political upheavals.
Changing seasons
b plato ppls
Economic
Refugees are people that have fled their native country, usually fearing for their lives.
I think you typed one of the words wrong up there. Migration usually doesn't influence itself, but I suppose one animal's migration might trigger another one's if it's the right time of year for it.
Yes,migration is survival usually birds or other creatures only migrate south because it gets cold.
The figure usually given is about 250,000 for the period 1933-1941. The figure includes political refugees as well as people fleeing racial persecution.
They usually go to the refuge on crowed trucks or walk to the refuge
Migration is usually a choice but can be forced on people or animals if their current habitat has been destroyed and the move is out of necessity.