The population size at a time ‘t’ can be calculated using the following formula:Nt+1 = Nt+ [(B+I) – (D+E)]What do I, B, D respectively stand for?    IBD1.ImmigrationMortalityNatality2.ImmigrationNatalityMortality3.EmigrationNatalityMortality4.MortalityNatalityImmigration

# The population size at a time ‘t’ can be calculated using the following formula:Nt+1 = Nt+ [(B+I) – (D+E)]What do I, B, D respectively stand for?    IBD1.ImmigrationMortalityNatality2.ImmigrationNatalityMortality3.EmigrationNatalityMortality4.MortalityNatalityImmigration

1. A

1

2. B

2

3. C

3

4. D

4

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### Solution:

The population size at a time ‘t+1’ can be calculated using the following formula:
Nt+1 = Nt+ [(B+I) – (D+E)]
where
Nt = population density at time ‘t’
Nt+1 = population density at time ‘t+1’
B = number of births (natality)
D = number of deaths (mortality)
I = immigration
E = emigration

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