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

Name: According to this figure, which organisms have the highest concentration of PCBs, and why?
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PCBs bioaccumulate as they move up the food chain, so organisms at higher trophic levels (such as herring gulls) will have higher concentrations of PCBs than those at lower trophic levels (such as phytoplankton). Smelt are in the middle of the food chain and would have intermediate concentrations of PCBs.

According to This Figure, Which Organisms Have the Highest Concentration