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

Which option is correct for curve $a$ and $b$ ?

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Equation for equation for Type of Type of

Curve $(a)$ curve $(b)$ curve $(a)$ curve $(b)$

Certain characteristic demographic features of developing countries are

Verhulst – pearl logistic growth equation

Phenomenal and rapid increase of population in a short period is called