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Match the following columns...

Match the following columns

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The correct Answer is:
A, B, C, D
A `to` c Defecation by living beings produces pollutants such as amoeba, fungicides, etc.
B `to` a Industrial operation produces pollutants such as mercury, arsenic, etc.
C `to` d Water released from thermal power plants is favourable for growth of algae.
D `to` b Agricultural activities produce pollutants such as insecticides, fungicides, etc.
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