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6. Urea is an impurity present in sewage.7.is a term used for the undesirable substances present in water.8. The kinds of material present in the wastewater are called Lon |
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Answer» ong>ANSWER: the answer to this question is 7 ie. ,a term used for impurity PRESENT in water as in our body as well urea is prese5which is excreted out in solution of water |
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