Why did Romans implement the use of sewers and aqueducts ?

Its purpose was removing water that pooled on the city's uneven streets and draining water from low-lying areas when the adjacent tiber river flooded,which happened quite frequently.

Explanation:

It's main function was drainage and what it drained ran right back into Rome's drinking supply before the aqueducts.

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the correct answer is a) egypt and china.

egypt and china are two of the world’s oldest civilizations known by man. both ancient empires have left a great historic and cultural legacy to the world through archeology. both civilzations developed complex social relations, had deep religious beliefs, had dominion of agriculture and left writing records to understand their customs and culture.

among the requirements to consider a civilization, we find urbanization, writing records, a place of residence, agriculture methods, technological specialization, means of transportation, currency, population density, social stratification, and political integration.