Answer: the aryans
Explanation:
They aryans crosses the Hindu Kush mountains and cane in contact wth the Indus Valley
Answer: Aqueducts
Explanation: They were first developed around 312 B.C., these engineering marvels used gravity to transport water along with the stone, lead and concrete pipelines and into city centers. Aqueducts liberated Roman cities from reliance on nearby water supplies and proved priceless in promoting public health and sanitation.
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