The given age pyramid for human population indicates:

At one time,the number of cheetahs in a habitat is $80$. Their birth rate is $4$ and death rate is $2$. Among them,$6$ cheetahs are internal migrants (immigration) and $3$ cheetahs are migratory (emigration). Calculate the population density of cheetahs in that habitat.

In a pond,there were $500$ carp fishes at the beginning of the year. They have a birth rate of $4$ offspring per carp per year. What will be the total number of carp fish at the end of that year?

The least densely populated state of India is

The absolute natality is . . . . . . realised natality.

Study the figure and identify $A, B, C,$ and $D$ in relation to their effect on population density.