A．Migration exerts a great impact on population change.
B．Migration contributes to Mankind's progress.
C．Migration brings about desirable and undesirable effects.
D．Migration may not be accompanied by human conflicts.
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A．He thought genes can tell where people have come from.
B．He wrote a book about the history of genes.
C．He read the first history book at Stanford University.
D．He agreed human migration was from Transcaucasia and central Asia.
A．human adaptability.
B．human evolution.
C．cultural differences.
D．inter-group inequalities.
A．Farmers.
B．Workers.
C．Settlers.
D．Colonizers.