Members of the same species living in the same habitat interact with each other to form a ........ .

In the given figure,which factors are responsible for the increase in population density?

Which of the following states has the highest population density?

Consider the birth rate and death rate per year in a given population.
Total population after $5$ years $\rightarrow 100$
Number of individuals dying per year $\rightarrow 10$
Number of individuals born per year $\rightarrow 20$

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.

If in a pond there are $20$ lotus plants of last year and through reproduction $8$ new plants are added. Then the birth rate is