Ascientist wants to determine the effect of a new type of gasoline, he fills one with normal and the other with the new, which is the control group a: the car with the normal b: the car with the new c: the new type of gas d: the amount of gas used

A. The car with the normal

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.