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Secondary treatment uses _______ to clean the water. a. chemicals b. microorganisms c. screens d. skimmers
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2 votes
Secondary treatment uses _______ to clean the water.

a. chemicals
b. microorganisms
c. screens
d. skimmers

User Frederic Lavigne
by
8.5k points

1 Answer

5 votes
the correct answer is B. microorganisms

User ChuChuwi
by
8.2k points
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