The carrying capacity of a population is determined by its
Birth rate
Death rate
Limiting resource
Reproductive status
Population growth curve in most animals, except humans is
$A$ : Environmental resistance operate to slow down exponential phase in logistic population.
$R$ : Crash phase does not occur in this population
A biologist studied the population of rats in a barn. He found that the average natality was $250$, average mortality $240$, immigration $20$ and emigration $30$. The net increase in population is