Feathers recently taken from seabirds stuffed and preserved in the 1880s have been found to contain only half as much mercury as feathers recently taken from living birds of the same species. Since mercury that accumulates in a seabird’s feathers as the feathers grow is derived from fish eaten by the bird, these results indicate that mercury levels in saltwater fish are higher now than they were 100 years ago.
The argument depends on assuming that

Question

Examsnet · Accepted Answer

Correct Answer is : the process used to preserve birds in the 1880s did not substantially decrease the amount of mercury in the birds’ feathers

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