Which phrase describes an example of a model? a microscope that is used to observe a cell
a volcano that can explode made for a science fair project
a review paper that explains how a plant species grows
a news report that communicates information about climate change

Is there any answer choices?

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. 

Ithink the answer you're looking for is potato chips.