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

Which of the following can occur to two segments of a population if they are geographically isolated 1.) they can only share some types of genes 2.)both groups most likely become extinct 3.)they find a way to come back together 4.)eventually they become separate species