Which of charles darwin’s main points is depicted in the image?
organisms within a population compete with each other to survive.
over time, beneficial variations will be passed on to future generations.
more offspring are produced than can be supported by an environment.
all organisms within a population have an equal chance for survival.

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. 

Yes yes yes very good