Geographical isolation led to the development of a set of new genes in a population of sea lions. These genes created a mutation in their jaws after twenty generations. Which mode of evolution does this mutation represent?

When you are making a guess you are forming a hypothesis

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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