What was the MAIN purpose of the Roman aqueducts? to supply towns with clean water
B
to provide a way for ships to travel inland
C
to protect cities from invading armies
D
to show boundary lines between landowners
2020

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independent innovation during the abbasid caliphate

the correct answer is:   the domino theory states that if one country in a region came under the influence of communism, then the surrounding countries would follow in a domino effect.