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

Question

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

Quizplus · Accepted Answer

PCBs tend to accumulate and biomagnify up the food chain. Therefore, organisms at the top of the food chain, such as herring gulls, have the highest concentrations of PCBs.

According to This Figure, Which Organisms Have the Highest Concentration