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6. Urea is animpurity 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:

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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