試題詳解

45. Which of the following is a direct consequence of biological magnification?
(A) Ecosystems with higher primary productivity support larger populations of herbivores.
(B) Toxic chemicals, such as PCBs, become more concentrated in organisms at higher trophic levels.
(C) The total biomass decreases as you move up trophic levels in an ecosystem.
(D) Species with narrow habitat requirements are more vulnerable to extinction.