If `N =` population density at time t, then population density at time `t + 1` can be written as. `N_(t+1) = N_(t) + [(A+B)-(C+D)]`. Select the correct option for `A,B,C` and `D` in the above equation.

Options

A. `A` can be mortality and `B` can be natality
B. `B` can be immigration and `C` can be natality
C. `C` can be mortality and `D` can be immigration
D. `A` can be natality and `D` can be emigration.

Answer

D

Explanation

A and B are natality and immigration. They add to population density. C and D are mortality and emigration. They decrease population density.