If natality is represented by $-B$

If mortality is represented by $-D$

If immigration is represented by $-I$

If emigration is represented by $-E$

If population density is represented by $-N$

Then population density at time $t+1$ is represented by

  • A

    $N_{t+1}=N_{t}-[(B+I)]-i$

  • B

    $\left.\left.N_{t+1}=N_{t}+[ \mid B+I\right]\right]-[|D+E|]$

  • C

    $N_{t+1}=N_{t}+[(B+I)]+[|D+E|]$

  • D

    $\left.N_{t+1}=N_{t}-[\mid B+I)\right]+[|D+E|]$

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