Plz help! In a density-dependent population, a decrease in which of the following will most likely cause an increase in birthrate? Carrying capacity
Death rate
Emigration
Immigration

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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.