Explain how the ability to describe the pattern of ice ages over the past million years helps us to assess what is a
"normal" variation in Earth's atmosphere.

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The rate that would change would be the  searching efficiency/attack rate. there are only two other rates in this model: the  growth rate of prey, and the  predator or consumer mortality rate.the  searching efficiency/attack rate is what indicates how effectively can a predator capture its prey whether in the searching process or actual capturing/attacking process. 

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