Sigmoid growth curve is represented by

Verhulst-Pearl logistic growth is described by the equation:

The equation of Verhulst-Pearl logistic growth is $\frac{dN}{dt}=rN\left[\frac{K-N}{K}\right]$. From this equation,$K$ indicates:

Under which of the following conditions is the logistic population growth curve obtained?

High growth at the time of the exponential phase of the human population growth curve is due to:

Any species growing $A$ under unlimited resource conditions can reach enormous population densities in a short time. Darwin showed how even $B$ 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.