<span>By testing roles and integrating them into a single identity</span>
Treating a city's water supply to remove any bacteria and impurities as clean and hygenic water supplies benefits the public/society.
I think it's <span>1) self-regulation.</span>
Answer:
depends on what type, but most of them usually aren't healthy.
Explanation:
Hope my answer has helped you and if not i'm sorry.
