The cause of the decline in population in $1927$ was:

Graph $A$ and $B$ indicate:

The given population growth curve represents the logistic growth curve. In this curve,identify what $A$,$B$,and $C$ indicate.

Population growth is reduced by environmental resistance. This phase is known as:

Match the following columns:

Column-$I$ (Value of $r$)	Column-$II$ (Example)
$P. 0.12$	$I$. Flour beetle
$Q. 0.015$	$II$. Norway rat
$R. 0.0205$	$III$. Human population in India in $1981$

If the population size at time $N_{t+1}$ is $1000$,and there is no immigration or emigration,and the death rate is $50\%$ less than the birth rate,and the population size $1$ year ago $(N_t)$ was $800$,what is the number of births?