Which of the following is (are) correct in a predator-prey cycle?
A. A decline in the number of prey causes a decline in the number of predators.
B. A decline in the number of predators causes a decline in the number of prey.
C. An increase in the number of predators triggers an increase in the number of prey.
D. All of these are correct, causing an up-and-down cycle for each animal.
Answer: A
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