Answer:
because it's very unhygienic. nowadays, rivers are polluted , too. if we drink the water from a river without filtering and boiling then many germs and bacteria will enter our body which will make us sick and even lead to harmful or deadly diseases.
Step-by-step explanation:
hope it helps u..
Answer: rivers often contain harmful microorganisms such as viruses, bacteria, and parasites
Explanation: if ingested, it can cause plenty of illnesses including giardia and dysentery
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