Polar Bears are Top Predators,and Tests on Their Tissues Have

Question

Polar bears are top predators,and tests on their tissues have shown a surprising ____.  
A) resistance to warming
B) amount of protein
C) resistance to disease
D) amount of mercury and organic pesticides
E) amount of nutrients

Accepted Answer

Tests on polar bear tissues have shown high levels of mercury and organic pesticides, which are often found in their prey, such as fish and seals. Due to bioaccumulation, these chemicals accumulate in the polar bear's tissues at higher concentrations, making them potentially harmful to the bears themselves and their cubs.