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4. Public water supplies are unsafe in some parts of the world because the water

and
may carry

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Answer: Public water supplies are unsafe in some parts of the world because the water may carry bacteria.

Step-by-step explanation:

User Loomer
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Answer:

In many parts of the world, water taken directly from wells or public supplies is not safe to drink because it may carry waterborne parasites or other diseases. The water can be sterilized by boiling it, but fuel is needed to do so.

Step-by-step explanation:

User Kiafiore
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