The Process by Which a Lake Ecosystem Is Altered by Eutrophication

The process by which a lake ecosystem is altered by eutrophication involves several stages. Which of the following represents the correct ordering of stages in the chain of causation?

A) Algal populations die off; algal blooms occur; oxygen levels drop in deeper water; respiratory demand from decomposers increases; phosphorus input from sewage and agricultural runoff increases
B) Oxygen levels drop in deeper water; phosphorus input from sewage and agricultural runoff increases; respiratory demand from decomposers increases; algal blooms occur; algal populations die off
C) Phosphorus input from sewage and agricultural runoff increases; algal blooms occur; algal populations die off; respiratory demand from decomposers increases; oxygen levels drop in deeper water
D) Phosphorus input from sewage and agricultural runoff increases; algal blooms occur; oxygen levels drop in deeper water; respiratory demand from decomposers increases; algal populations die off
E) Phosphorus input from sewage and agricultural runoff increases; respiratory demand from decomposers increases; oxygen levels drop in deeper water; algal blooms occur; algal populations die off

Correct Answer:

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