Causes affecting population size

Question

What are the causes affecting population size and also describe population stabilization?

Answer 1

The causes affecting population size are:
a) Birth rate
b) Death rate
c) Immigration
d) Emigration
Population stabilization is the widely used term of Zero population growth (ZPG).
a) Birth rate = Death rate
b) Net immigrant = Net emigrant
c) There will be no increase or decrease of population.