The hypothesis that best describes the Lake Washington case study is that:
A) Lake Washington is unfit for public recreation.
B) increases in cyanobacteria numbers are a direct response to increased nutrient availability.
C) if the sewage is diverted, then the water quality of the lake will return to previous levels.
D) bacteria from municipal sewage are increasing in the lake.
E) human activity has had no impact on Lake Washington, it is undergoing a natural process.

Question

Quizplus · Accepted Answer

The Lake Washington case study describes how the increase in cyanobacteria numbers is directly related to increased nutrient availability. This hypothesis is supported by the observations of increases in phosphorus and nitrogen levels in the lake, as well as the correlation between periods of low dissolved oxygen and high cyanobacteria blooms. The other choices are either incorrect or incomplete hypotheses for the observed changes in Lake Washington.

The Hypothesis That Best Describes the Lake Washington Case Study