The process by which a lake ecosystem is altered by eutrophication inv – McqOptions

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1.	The process by which a lake ecosystem is altered by eutrophication involves several stages, each causing the next. Which of the following stages would occur second in the chain of causation?
A.	Algal blooms occur.
B.	Oxygen levels drop in deeper water.
C.	Phosphorus input from sewage and agricultural runoff increases.
D.	Respiratory demand from decomposers increases.
Answer» B. Oxygen levels drop in deeper water.

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