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11.Organisms and Populations
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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
$\left.N_{t+1}=N_{t}-[\mid B+I)\right]+[|D+E|]$
Solution
$N^{\prime}$ is the population density of time $t$ then its density at time $t+1$ is
$\left.\left.N_{t+1}=N_{t}+ [\mid B+I\right]\right]-[|D+E|]$
We can see from the above equation that population density increases if the number of birth plus number of immigrants ( $B+I$ b is more than the number of death plus the number of emigrants $(D+E)$
Standard 12
Biology
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