A scientist observed a sudden increase in the number of algae in a lake over
a few days. The reason behind it could be that
(A) Water cycle in the area got unbalanced
(B) Electronic wastes were being dumped in a nearby area
(C) A factory with heavy smoke discharge has been established nearby
(D) Heavy amount of chemical fertilisers were being used in a nearby field
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( D ) Heavy amount of chemical fertilisers were being used in a nearby field.
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