Question

The change in population size at a given time interval t, is given by the expression

$N_t=N_{\alpha }+B+I-D-E$

I, B and D stand respectively for

• A. Rate of immigration, mortality rate, natality rate
• B. Rate of emigration, natality rate, mortality rate
• C. Mortality rate, natality rate, rate of immigration
• D. Mortality rate, rate of immigration, natality rate
• E. Rate of immigration, natality rate, mortality rate

Answer 1

Answer: (E)

Rate of immigration, natality rate, mortality rate

The formula given is about the change in population size at a given time interval t, I, D and E stand for rate of immigration, natality rate, and mortality rate respectively.

Immigration is the action of coming into an area from another area or country.

Natality is the ratio of the number of births to the size of the population, birth rate.

Mortality is the relative frequency of deaths in a specific population, death rate.

So, the correct answer is option E.