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The most serious water pollutants are th...

The most serious water pollutants are the disease causing agents called pathogens. Which of the following statements is/are true ?
I. Pathogens include bacteria and other organisms that enter water from domestic sewage and animal excreta.
II. Human excreta contain bacteria such as Escherichia coli and Streptococcus faecalis which cause gastrointestinal diseases.

A

only I

B

only II

C

I and II

D

None of the above

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