Self-purification of running streams may be due to

1.	Self-purification of running streams may be due to
A.	sedimentation, oxidation land coagulation
B.	dilution, sedimentation and oxidation
C.	dilution, sedimentation and coagulation
D.	dilution, oxidation and coagulation
Answer» C. dilution, sedimentation and coagulation

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Self-purification of running streams may be due to

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