According to This Figure, Which Organisms Have the Highest Concentration

question 20

Multiple Choice

According to this figure, which organisms have the highest concentration of PCBs, and why?

• A)phytoplankton, because they are at the bottom of the food chain
• B)herring gulls, because they are at the bottom of the food chain
• C)herring gulls, because they are at the top of the food chain
• D)smelt, because they are in the middle of the food chain

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