3 The melting of the ice sheet — A allowed migrants to cross Canada on foot
B prevented migration across Beringia
C ended the coastal migration
D had no special impact on migration

Why are nongovernmental organizations important? check all that applya. they are private institutions that aid the work of government.b. they often fill in gaps between government-funded services. c. they are private institutions that attack government policyd. they citizens by acting as watch dogs over elected officials

Do you guys know all the answers to this

The european union was formally established in