Answers

2016-02-07T09:35:20+05:30
Because they contain Bacteria which is harmful for human health
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2016-02-07T09:36:52+05:30
The appearance of the water is not always a guarantee that it is safe to drink, but water that is clear, free of surface dirt or debris, and has no odor is more likely be to free of contaminants than cloudy, smelly water that has a surface dirt
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hope it helps

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