A scientist suspects that a certain lake has become polluted in the years since a dairy farm was built along its shores. To confirm her suspicions, the scientist performs several tests on the lake's water. The tests reveal that since the farm was built, the lake's dissolved oxygen levels have decreased by 30 percent, and nitrate levels have nearly doubled; tests also reveal the presence of E. coli in the water. Do these data confirm the scientist's suspicions that the lake is polluted? Explain your answer. Explain how the dairy farm could be responsible for each change measured by the scientist
A pond in a town is suffering from the effects of an algal bloom. In response, the town council passes legislation banning the use of phosphate-based fertilizers. Explain the reasoning behind this action. Is the ban likely to be effective at combating the algal bloom? Explain your answer.