Sigmoid growth curve is represented by
$d N / d t=r N$
$d N / d t=r N(1-N / K)$
$N t=N_{o}+B+I-D-K$
$d N / d t=1-N / K$
The physiological capacity to produce offsprings is called
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
If natality rate is parallel to mortality rate then population
Any species growing ...$A$... under unlimited resource conditions can reach enormous population densities in a short time. Darwin showed how even $\ldots$ $B$... growing animal like elephant could reach enormous numbers in absence of check and that characteristics of organism is called $C$
Choose the correct option for $A , B$ or $C$ respectively