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The natural ageing of a lake by nutrient enrichment is called:

AEutrophication
BBiomagnification
CSedimentation
DDesertification
Answer & Solution
Correct answer: A. Eutrophication
1. Streams bring in nitrogen and phosphorus. 2. This is eutrophication. 3. Human effluents accelerate it into cultural eutrophication. _Source: syllabus Biology, Chapter 16, Environmental Issues._
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