Answer
(e) All of the above
Work Step by Step
An excess of sewage running into a freshwater reservoir could cause the water to become polluted and nonpotable, could cause an increase in the biological oxygen demand (BOD), could cause oxygen depletion, leading to an increase in the anaerobic microbial population; and large quantities of organic wastes could be left behind, killing off many plants and animals or causing animals to migrate.
