However, as cities became larger and population densities increased, one major advancement was the development of _______, which helped to channel wastewaters away from human populations more effectively than in the past.



Answer :

As cities becomes larger and population densities increased, one major advancement was the sewage which helped to channel wastewater away from human population.

For the good health of the humans sewage treatment is most essential. Sewage plants greatly reduce the risk of disease by removing harmful substances from wastewater. unclean water poses significant risks of diarrheas', opportunistic infections and malnutrition. In this the big sewer pipes take all the sewage to a place where it is treated. This place is called a sewage treatment plant. All towns and cities have these. They are like a big factory where any harmful materials are removed.

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