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27. In a predator-prey cycle A. a decline in the numbers of predators causes a decline in the number of prey. B. a decline in the numbers of prey causes a decline in the number of predators. C. an increase in the number of predators triggers an increase in the number of prey. D. All of the choices are correct, causing an up-and-down cycle for each animal. E. None of the choices are correct since this is a seasonal die-off that would occur without the other species present.

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Okay, to answer this question you need to think about this, if a predator eats prey the predator numbers are controlled by prey numbers (so the more prey the more predators). On the other hand prey numbers are kept down by the number of predators. Tell me which one you think it is and I'll tell you if you are right :)
i was thinking it was C
Nope not C, If there are more predators around eating more prey, do you think there would be more prey?

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Other answers:

oh A
Hmm you're still picking the same type of relationship here, not A, if there are less predators there are not going to be less prey as there is now less of the prey being eaten.
Think about it like this, if there are three lions and one zebra, two lions are going to get hungry and die (so less prey, less predators). If there is one lion and three zebras those zebras are going to be living the high life and will keep breeding and make this huge family (as the lion can only kill one at a time), so low predators = high prey.
B :)
Yup :D
Good job. Predators eat prey. So, if the number of prey goes down, the predators won't have enough food. Because of that, the number of predators will ALSO go down.
No problem :)

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