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biological indicators. In developed countries, sewage often causes problems when people flush chemical and pharmaceutical substances down the toilet. When people are ill, sewage often carries harmful viruses and bacteria into the environment causing health problems. Sewage is treated in water treatment plants and the waste is often disposed into the sea. Domestic households, industrial and agricultural practices produce wastewater that can cause pollution of many lakes and rivers. Implementing recycling habits into your daily life is one of the most

 

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