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(B) The process described is known as eutrophication. $1$. Excessive fertilizers (rich in nitrates and phosphates) enter the pond,leading to an overgr

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The fish population will decrease due to oxygen depletion.

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(B) The process described is known as eutrophication. $1$. Excessive fertilizers (rich in nitrates and phosphates) enter the pond,leading to an overgrowth of algae (algal bloom). $2$. When these algae die,decomposers consume large amounts of dissolved oxygen in the water to break them down. $3$. This leads to a significant decrease in the dissolved oxygen levels in the pond. $4$. Consequently,the fish population will decrease in the long run due to the lack of oxygen required for their survival.

During heavy rain in a village,rainwater carried excessive fertilizers to a pond. How will it affect the fish population in the pond in the long run?

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