The density of a population.in a given habitat during a given period, fluctuates due to changes in four basic processes. On this basis fill up A and B boxes in the given diagram with correct options -

Options

A. A = Natality + Emigration, B = Mortality + Immigration
B. A = Birth rate + Death rate, B = Migration + Emigration
C. A = Natality + Mortality, B = Immigration + Emigration
D. A = Natality + Immigration, B = Mortality + Emigration

Answer

D

Explanation

Population size will increase if number of (B+I)> number of (D+E)
Population size will decrease if the number of (B+I) < number of (D+E)