試題詳解

12. Why are big, predatory animals rare? Most big, predatory animals are tertiary consumers, which implies that
(A) typically, they are highly territorial.
(B) It's hard for an ecosystem to support many of them because so much energy is lost at each level of energy exchange.
(C)By overexploitation, humans have caused many predatory species to become endangered.
(D) It takes a long time for big, predatory animals to evolve.
(E) It's hard for a big animal to move through dense vegetation