Instead of addressing the symptoms of cultural eutrophication the neighborhood pond, the neighborhood association could address the cause of the problem by
A) treating the pond with copper sulfate.
B) aerating the pond with underwater pipes.
C) reducing the use of lawn fertilizers.
D) draining the pond every few years.
Question 2
The dependency ratio for high-income countries has risen because
A) more people work to keep per capita incomes high.
B) as per capita income rises, family size increases.
C) as per capita income rises, people marry at a younger age.
D) life-spans are longer following a demographic window.
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