The amount of PCBs in herring is approximately _____________…
The amount of PCBs in herring is approximately ______________ times higher than in the zooplankton. Trophic Level Productivity PCB (ppb) Phytoplankton 5048 1.56 Zooplankton 506 2.85 Herring 91 24 Seabird 12 3341 Porpoise 2 13698
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