Question

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

• 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 1

Answer: (D)

$A$ can be natality and $D$ can be emigration

Answer 2

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