Answer the following questions. 1. How are some bacteria useful to us? 2. Why do weeds harm crop plants? 3. What is a polymer? 4. List any three methods to prevent corrosion. 5. What can be obtained from coal tar?
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bacteria is very harmful and also useful for us ex -. it helps us to make curd , butter etc
and it also harmful for us ex- it spoils our vegetables , bread etc
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