Information on birth-rate,death-rate,sex-ratio,and age distribution of a population can be obtained from:

Which of the following are useful for measuring population density (size)?
$(a)$ Numbers
$(b)$ Biomass
$(c)$ Pug marks
$(d)$ Height

Under a particular set of selection pressure,organisms evolve towards the most efficient reproductive strategy. For example:
$A$) Oysters produce a large number of small-sized offspring.
$B$) Mammals produce a small number of large-sized offspring.
In the light of the above statements,choose the correct option.

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

Which type of population is more efficient in all types of work?

How is a population structured?