The population density of India is:

In a pond, there were $20$ lotus plants and $10$ new plants were added. Calculate the birth rate for the year.

The minimum death rate of a population is called:

The most important factor which determined the increase in human population in India during the $20^{\text{th}}$ century.

In a laboratory population of $40$ fruit flies, if $4$ flies die in a week, what is the death rate?

At one time,the number of cheetahs in a habitat is $80$. Their birth rate is $4$ and death rate is $2$. Among them,$6$ cheetahs are internal migrants (immigration) and $3$ cheetahs are migratory (emigration). Calculate the population density of cheetahs in that habitat.