Nutrients from croplands are carried by the Mississippi River into the Gulf of Mexico. If nutrients are good for growth, why are scientists concerned about this nutrient influx?
A) Higher productivity may support greater numbers of sharks.
B) Higher productivity may support greater diversity of phytoplankton species.
C) Higher productivity may result in increased respiration on sinking algal material, depleting oxygen within gulf waters.
D) The nutrient runoff depletes nitrate, which cannot be made industrially.
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