In a population,the condition at which the rate of addition of new members is more than the rate of individuals lost indicates:

The cause of zero growth of population is

The population of an insect species shows an explosive increase in numbers during the rainy season,followed by its disappearance at the end of the season. What does this show?

Certain characteristic demographic features of developing countries are:

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?

Slow population growth was due to a high birth rate and a high death rate,which characterized the stage of: