48. A study of red deer in Scotland showed that females that reproduced in a given summer were more likely to die during the next winter than females that did not reproduce. Which of the following can best explain the above observation?
(A) Trade-off 
(B) Competition for resources
(C) Density-dependent population regulation
(D) Population dynamics

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統計: A(1), B(0), C(1), D(0), E(0) #3222925

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