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The most common source of infectious diseases in water supplies is _______.

a.
algal blooms
b.
sewage
c.
surface runoff
d.
none of the above



CORRECT ANSWER IS B

User Lanfang
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2 Answers

3 votes
I thought it was surface runoff
User Zermingore
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2 votes

Answer:b

Step-by-step explanation:

User Cxyz
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