Why do Human populations continue to suffer from sewage-carried pathogens ?

  • Thread starter Thread starter Gagan B
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Gagan B

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a. humans are particularly sensitive to disease
b. human pathogens are particularly virulent
c. humans live, work, and reproduce in situations of high population density
d. there are more kinds of human pathogens
e. human pathogens are both virulent and high in number
 
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