As of 2013 pit latrines are used by an estimated _____________ people.
A) 1.77 billion
B) 2.77 million
C) 1.77 billion.
D) 4.66 billion
Correct Answer:
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Q9: The term "septic" refers to _
A)anaerobic bacterial
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Q14: As a very general guideline it is
Q15: A _houses the squatting pan or toilet
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