The percentage ratio of natality over mortality is called

If natality rate is parallel to mortality rate,then the population:

How is a population structured?

Natality of a region is assessed by the rate of . . . . . . of individuals per unit area,per unit time.

Under a particular set of selection pressure,organisms evolve towards the most $A$ reproductive strategy. Some organisms breed only $B$ in lifetime while others breed $C$ in lifetime. Choose the correct option for $A, B$ and $C$.

If the age pyramid of a population is bell-shaped,it will show: