The triple alliance created tension in europe by doing which of the following (check all that apply):

they settled their differences with morocco and egypt to build a bigger alliance.
germany moved into the balkan states.
germany's proposed railroad
the animosity between serbia and austria
the hatred between germany and austria-hungary

- Germany moved into the Balkan states.

- The animosity between Serbia and Austria.

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Germany moved into the Balkan states.

The animosity between Serbia and Austria

Explanation:

Going rivalries among nations in Europe led to the formation of Alliance system which led to creating more tension between European nations, different nations were creating different alliances like dual alliance and triple alliances and some alliances were secret which came out like surprise when war broke out between two nations.

Both central and Allied forces formed the Triple alliance during great war central powers created a triple alliance between Germany, Italy, and Austria-hungry while on the other hand, Allied forces created a triple alliance between England, France, and Russia.

explanation:

the addition to geographic boundaries that might have  kept the people of the huang river civilization from traveling to far distance region is that they had learned about the other river valley civilizations but feared contact would bring invasion.

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explanation: