Explain eutrophication and its typical sequence from nutrient input to hypoxic zones.

Explain eutrophication and its typical sequence from nutrient input to hypoxic zones.

• A. Excess nutrients from runoff fuel algal blooms; decomposition consumes oxygen; leads to hypoxic zones that kill aquatic life.
• B. Water temperature rise causes oxygen solubility to increase, leading to hypoxic zones.
• C. Introduction of saltwater reduces freshwater species, causing hypoxia.
• D. Nutrient input decreases algal growth, stabilizing oxygen levels.

Answer: (A)