"Population is an auto-regulated system" was said by

Which of the following statements is true regarding individuals of the same species?

In an $Urn$-shaped age pyramid of the population,the trend of growth is:

In the given diagram,identify $a, b, c,$ and $d$. Specifically,identify $b$ and $c$.

If natality is represented by $B$,mortality by $D$,immigration by $I$,emigration by $E$,and population density by $N$,then the population density at time $t+1$ is represented by:

What is formed by the aggregation of individuals of a species?