Industrial wastes, oils and fats should not be thrown into the drains because they can:
A
kill mosquitoes
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B
kill the useful microbes
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C
harden and block the pipes
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D
breed fishes
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Solution
The correct option is C harden and block the pipes Oils and fats from Industry should not be thrown into the drain. They can harden and block the pipes. In an open drain, the fats clog the soil pores reducing its effectiveness in filtering water.