A lake has been polluted by sewage; compare the water in the lake with unpolluted water.
A sewage polluted lake has lesser dissolved oxygen in water than unpolluted lake which leads to death of aquatic organisms.
Lake polluted with sewage may contain bacteria, viruses, fungi and parasites which cause diseases like cholera, typhoid and jaundice but lake with unpolluted water would not cause us such diseases or any infections. All plants and organisms being exposed to polluted water lake can be impacted. It can also damage individual species.
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