28. One cause of ww1 is the assassination of the archduke Fran Ferdinand.
The second cause is Austria-Hungary threatens war on Serbia
29. Trench warfare
30. Germany has to pay 33billon in reparations
Germany has to take full responsibility for the war
African Americans gained freedom from joining World War 2
The transfer of plants, animals, people, and diseases between hemispheres. This would be the correct answer!!!
Answer:
um noo !!!!!!!!!!!!!!!!!!!!!!!!!!!!