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What is a primary cause of fish population decline in freshwater ecosystems?

Chemical runoff from agricultureNatural predators increasingOverfishing in oceansIncreased recreational fishing

Which chemical component in runoff is most detrimental to aquatic life?

NitratesCalciumMagnesiumIron

How does chemical runoff contribute to the formation of dead zones in aquatic environments?

By causing algal blooms that deplete oxygen levelsBy increasing water temperatureBy providing excess nutrients for fishBy introducing invasive species

Assessment

What is a primary cause of fish population decline in freshwater ecosystems?

Which chemical component in runoff is most detrimental to aquatic life?

How does chemical runoff contribute to the formation of dead zones in aquatic environments?