Biology for IGCSE & O level - Diseases And Immunity (Section 3 - No. 7)
How does sewage treatment contribute to the prevention of disease spread?
It eliminates all the pathogens.
It breaks down the pathogens so they can no longer cause infection.
It adds pathogens to the environment.
It removes essential minerals from the water.
Explanation
Sewage treatment breaks down pathogens.
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