HIV did not begin to spread throughout the African continent until the 1970s.
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Q1: The breakdown of man-made compounds by decomposers
Q2: Indicator bacteria are _.
A)coliforms
B)enterococci
C)evidence of fecal contamination
D)used
Q4: Potable water is _.
A)contaminated
B)polluted
C)safe to drink
D)foul tasting
E)None
Q5: What two strategies are used in the
Q6: In the secondary phase of water treatment,
Q7: Which of the following factors contributed to
Q9: The final step of sewage treatment before
Q10: The use of "coliform" and "E.coli" when
Q11: Monitoring of drinking water and recreational water
Q19: Primary sewage treatment includes
A)sludge digesting.
B)skimming.
C)filtration.
D)chlorination.
E)aeration.
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