First slide

Populations

Question

If ‘Nt’ is the population density at time t, ‘B’ is natality, ‘D’ is mortality, ‘I’ is immigration, ‘E’ is emigration then then the density of the population at time t +1 is

Easy

A

$N_{t} + [(B + D) - (I + E)]$
B

$N_{t} + [(B + I) - (D + E)]$
C

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

$N_{t} + [(B - I) + (D - E)]$

Solution

Natality and immigration contribute to an increase in the population size while mortality and emigration contribute to a decrease in the population size.
If ‘Nt’ is the population density at time t, ‘B’ is natality, ‘D’ is mortality, ‘I’ is immigration, ‘E’ is emigration then then the density of the population at time t +1 is $N_{t} + [(B + I) - (D + E)]$ .

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