Open population is a population which is able to gain and lose outside members different populations over time.
Here the population growth is dependent on the rate of reproduction and the starting population. It will be impacted by death rate and also the rate of individuals leave and join the population.
Mortality is the state of being subjected to death
Natality is the ratio of number of births to the size of the population
Migration is the movement of people from one area to another .
So, the correct option is ALL OF THE CHOICES ARE CORRECT