Population growth of a country depends upon

  • A

    Birth and death rates

  • B

    Death rate and emigration

  • C

    Birth rate and emigration

  • D

    All of the above

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The following graph depicts changes in two populations $(A$ and $B)$ of herbivores in a grassy field. $A$ possible reason for these changes is that

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Carrying capacity is

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$A.$ Population density after time $t$

$B.$ Population density at time zero

$C.$ Intrinsic rate of natural increase

$D.$ The base of natural logarithms $(2.71828)$

Identify $A, B, C$ and $D$ from the given equation

Change in population size equation with prolonged exponential phase can be converted into logistic growth equation by multiplying it with