The geometric representation of age structure is known as:

When there is a large number of post-reproductive or older individuals and a lesser number of pre-reproductive individuals,then that population is:

Ecological age groups of a population are:
$I.$ Pre-reproductive
$II.$ Reproductive
$III.$ Post-reproductive
$IV.$ Old-age group
$V.$ Adolescent age group
$VI.$ Infertile age group
Choose the correct option for the given statements.

The size of population does not depend on?

The type of population,where pre-reproductive animals occur in large numbers,is

$A$ biologist studied the population of rats in a barn. He found that the average natality was $250$, average mortality $240$, immigration $20$ and emigration $30$. The net increase in population is