The excess nitrogen associated with a(n)_________________________ can cause extensive fish kills,shellfish contamination,and severe respiratory irritation for humans living nearby.

Shellfish Contamination

refers to the pollution or harmful contamination of shellfish (such as oysters, clams, and mussels) by pollutants including chemicals, heavy metals, and pathogenic microorganisms which can render them unsafe for human consumption.

Respiratory Irritation

The discomfort or inflammation of the respiratory tract, often caused by pollutants, allergens, or pathogens, leading to symptoms like coughing or difficulty breathing.

Excess Nitrogen

An overabundance of nitrogen in the environment, often resulting from agricultural fertilizers, which can lead to water pollution and ecosystem imbalances.