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Eutrophication is often the result of _______.

Aincreases in animal populations
Black of oxygen in the water
Cfertilizer runoff entering aquatic ecosystems
Da decrease in phytoplankton populations

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Eutrophication is often the result of fertilizer runoff entering aquatic ecosystems. The answer is letter C. 

Answer: c. fertilizer runoff entering aquatic ecosystems

Eutrophication is a phenomena which occurs when the water body becomes over-enriched with the minerals and nutrients which get deposited due to surface run off. This results in the excessive growth of algae and other plants, the available oxygen present in the water depletes which results in the mortality of the aquatic animals.

The fertilizers which are used for the purpose of agriculture, are taken away by the water and wind erosion. This water gets added up to the water body. Hence, resulting in eutrophication.  

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