the dark lake is heaven for duckweeds and spirogyra a strong pungent smell pervades the air and aquatic animals are hardly seen . this is an example of a) biomagnification b) eutrophication c) water pollution d) greenhouse effect in water
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the dark lake is heaven for duckweeds and spirogyra a strong pungent smell pervades the air and aquatic animals are hardly seen . this is an example of a) biomagnification b) eutrophication c) water pollution d) greenhouse effect in water
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