AP Environmental Science Exam

The primary cause of hypoxic dead zones in coastal marine ecosystems is:

Thermal pollution from power plant cooling water Nutrient runoff (nitrogen and phosphorus) from agriculture that causes algal blooms and oxygen depletion Plastic debris that blocks sunlight and prevents photosynthesis Overfishing that removes organisms that would otherwise oxygenate the water

Correct Answer:

Nutrient runoff (nitrogen and phosphorus) from agriculture that causes algal blooms and oxygen depletion

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