According to the population of different states of India,Madhya Pradesh is placed at which position?

The minimum death rate of a population is called:

Define the following terms:
$(1)$ Immigration
$(2)$ Emigration
$(3)$ Mortality

Which age group of organisms constitutes the pre-reproductive population?

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.

$A$ biologist studied a rat population at the time of birth. He observed that the estimated births were $250$, estimated deaths were $240$, $20$ rats immigrated into the population, and $30$ rats emigrated from the population. What was the net increase in the population?