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High amount of esherichita coli in water is an indicator ofA. hardness of waterB. industrial pollutionC. sewage pollutionD. pollution due to electromagnetic radiations

Answer» Correct Answer - C
High amount of Escherichia coli in water indicates sewage pollution. E. coli bacteria are good indictor of faecal contamination because they generally live longer than pathogens, are found in greater number.


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