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Question 1 of 5
Oysters absorb the chemicals that are present in the water they live in; therefore, examining the chemical concentrations in oyster tissue can indicate levels of industrial pollution. However, the results of such examination must be interpreted carefully. For example, high levels of cadmium in oysters along the West Coast of the United States can be attributed not to pollution by industry, but to upwelling of deep ocean water, which contains more cadmium than surface ocean water.
The passage is primarily concerned with