Answer:
B. When nitrogen mixes with a body of water leading to excessive growth of algae.
An example of nutrient pollution is when nitrogen mixes with a body of water leading to excessive growth of algae.
• Nutrient pollution occurs when many nutrients such as "phosphorus or nitrogen are added to ocean, rivers or seas".
• Nutrient pollution destroys the environment. It also harms the quality of water and can kill aquatic animals.
• Sources of nutrient pollution include septic tanks, industries, fossil fuel, aquaculture, etc.
• An example of nutrient pollution is when nitrogen mixes with a body of water leading to excessive growth of algae".
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