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I disagree with GForce's explanation; the meaning is not that growth of prey populations causes instability in predator species. The sentence is merely saying that without predation, prey population growth is more likely to be at a level which leads to ecosystem instability. The term "but for predation" means "if it wasn't for the effects of predation". In ...


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It's essentially saying that high densities of prey species can cause ecosystem instability not only for themselves but also for the predators which prey upon them. In other words, high densities of prey species not only cause ecosystem instability by competing with each other, but this instability can move up the food chain and affect predators at higher ...


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I don't know if this is just me, but I'd consider this a pretty badly worded question. For models of population dynamics, the rate at which the size of a population changes over time is normally accepted to be the net balance of four fundamental processes: Birth, Immigration, Death, and Emigration ('BIDE'; see for example here). Birth and immigration ...


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I feel answers A & C are more obvious. option D is countered by Birthrate. also, migration is a temporary affair, check its meaning (An instance of moving to live in another place for a while). whereas emigration is to permanently move to a new location and populate that area.



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