Maximum survival and reproductive capacity shown by a population under optimal environmental conditions is called

Give differences : Immigration and Emigration

If natality is represented by $-B$

If mortality is represented by $-D$

If immigration is represented by $-I$

If emigration is represented by $-E$

If population density is represented by $-N$

Then population density at time $t+1$ is represented by

If a population growing exponentially double in size in $3$ years, what is the intrinsic rate of increase $(r)$ of the population?

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