Chemistry, 20.02.2020 20:01 pacpac1172
In very early human history, complex sanitation systems were not needed because settlements were usually very small, like the village below. However, as cities became larger and population densities increased, one major advancement was the development of which helped to channel waste waters away from human populations more effectively than in the past
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In very early human history, complex sanitation systems were not needed because settlements were usu...
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