The formula of growth rate for population in a given time is
$d t / D N=r N$
$d t / r N=d N$
$r N / d N=d t$
$d N / d t=r N$
If the mean and the median pertaining to a certain character of a population are of the same value, the following is most likely to occur
Rapid decline in a population due to high mortality rate is
$J-$shaped growth curve depicts
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