The condition that indicates a polluted envir | vedclass

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(B) Eutrophication is the process in which nutrient-enriched water bodies support a dense plant population,such as algae. This excessive plant growth

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eutrophication

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(B) Eutrophication is the process in which nutrient-enriched water bodies support a dense plant population,such as algae. This excessive plant growth consumes dissolved oxygen,leading to the death of aquatic animal life due to oxygen deprivation. This process results in a significant loss of biodiversity and is a clear indicator of a polluted environment. In contrast,a $BOD$ value of $5 \ ppm$ is considered clean,$0.03 \%$ $CO_2$ is normal atmospheric concentration,and a $pH$ of $5.6$ is the natural acidity of unpolluted rain.

The condition that indicates a polluted environment is

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