Dead Zones are caused by ____ that introduce(s) nitrogen and phosphorus into aquatic ecosystems. These nutrients lead to algal blooms and subsequent hypoxic conditions when the _______drop below the level necessary to sustain most animal life. The Gulf of Mexico Dead Zone is caused by this phenomenon.
A. ocean acidification; pH levels
B. non-point source runoff; dissolved oxygen levels
C. point source polluters; CO2 levels
D. volcanic eruptions; pH levels
Answer: B. non-point source runoff; dissolved oxygen levels
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