In some tribes,the population does not grow appreciably because of

If $N$ is the population density at time $t$,then its density at time $t+1$ can be calculated as . . . . . . .

What is the formula for exponential population growth?

Populations evolve to maximize their reproductive fitness,also called Darwinian fitness,with:

The statement 'Food supply increases in an arithmetic progression,while population tends to increase in a geometric progression' was proposed by:

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?