Which of the following is a broad measure of economic production in a country and can show change and growth from year to year? *
1.Human Development Index (HDI)
2.Gross Domestic Product (GDP) per capita
3.Inflation
4.Gross Domestic Product (GDP)

The casefor proofs

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.