asked 230k views
4 votes
Clean, safe water and improved sanitation have contributed to which of the follow?

a. the control of infectious disease.
b.better government social control.
c.better studies of the population's drinking habits.
d.cancer-causing microorganisms.

1 Answer

2 votes
the answer is A !!!!!!!!!!!
answered
User CHEBURASHKA
by
8.4k points
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