Between 1976 and 1985, chemical wastes were dumped into Cod Bay. Today, 3 percent of the bay' s bluefin cod population have deformed fins, and wary consumers have stopped buying the fish. In seeking financial reparations from companies that dumped the chemicals, representatives of Cod Bay' s fishing industry have claimed that since the chemicals are known to cause genetic mutations, the deformity in the bluefin cod must have been caused by the presence of those chemicals in Cod Bay. The answer to each of the following questions would be helpful in evaluating the representatives' claim EXCEPT: ['Are there gene-altering pollutants present in Cod Bay other than the chemical wastes that were dumped by the companies?', 'Has the consumption of the bluefin cod from Cod Bay that have deformed fins caused any health problems in the people who ate them?', 'Are bluefin cod prone to any naturally occurring diseases that can cause fin deformities of the same kind as those displayed by the bluefin cod of Cod Bay?', 'What was the incidence of deformed fins in bluefin cod in Cod Bay before the chemical dumping began?']