Sources of water are to contain pathogenic bacteria, Biology

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What sources of water are (a) most likely, (b) least likely to contain pathogenic bacteria?

 

(a) Water most likely to have pathogenic bacteria will be that which receives untreated or   partially treated sewage.

(b) Water least likely to be contaminated will be that which comes from unpopulated areas or has filtered by rock layers into underground aquifers.

 


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