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
$5$
zero
$10$
$15$
What is meant by growth models?
In nature, a given habitat has enough resources to support a maximum possible number, beyond which no further growth is possible. This characteristic feature of nature is known as
Verhulst - pearl logistic growth is described by the equation.
Exponential Growth curve is: