The apex of the age pyramid of a stationary population is

$A$: Under unlimited resource conditions,a population can show an exponential growth curve.
$R$: $A$ maximum possible number of individuals can always be supported when enough resources are available.

Which one of the following is $INCORRECT$ about the logistic growth model?

The human population growth graph is:

The capacity of an environment to support a limited number of individuals is known as:

Read the following statements and determine how many of them are correct:
$(1)$ Population is the total number of individuals of a species in a given area at a given time.
$(2)$ Developed countries show a low birth rate.
$(3)$ An equal proportion of reproductive and post-reproductive age individuals indicates a stable population.
$(4)$ In the presence of limited resources,the growth curve is sigmoid ($S$-shaped).