Which of the following sequences correctly describes the process of eutrophication in freshwater systems?
1 )
Fertilizer runoff → increased nutrient levels → death of aquatic plants → oxygen depletion → death of aquatic animals
2 )
Fertilizer runoff → decreased nutrient levels → algal bloom → oxygen depletion → death of aquatic animals
Fertilizer runoff → increased nutrient levels → algal bloom → death of algae → bacterial decomposition → oxygen depletion → death of aquatic animals
4 )
Fertilizer runoff → increased nutrient levels → algal bloom → increased oxygen levels → death of aquatic animals
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