ZoologyThe 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:
N_t+1 = N_t+ [(B+I) – (D+E)]
What do I, B, D respectively stand for?
I B D
1. Immigration Mortality Natality
2. Immigration Natality Mortality
3. Emigration Natality Mortality
4. Mortality Natality Immigration

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