Zoology - Organisms and Populations Question with Solution | TestHub

Natality rate, also called birth rate for a population. It is a measure of number of births occurring in a population in a particular time period. It is denoted by letter$\mathrm{B.}$

Mortality rate is the measure of number deaths in a particular population for a particular time period. It is denoted by letter$\mathrm{D.}$

As per the graph, the population is maintained where in the population count is remains stable. Such scenario occurs when the birth rate is same as that of the death rate. Thus, natality is equal to mortality.