Random genetic drift in a population probably results from

Prodigality of reproduction in Darwinism refers to:

Genetic drift operates in

In the case of the peppered moth $(Biston \text{ } betularia)$, the black-coloured form became dominant over the light-coloured form in England during the industrial revolution. This is an example of:

Arrange the events of Darwinism in the correct sequence.
$I -$ Natural selection
$II -$ Variations and their inheritance
$III -$ Survival of the fittest
$IV -$ Struggle for existence

Genetic drift is observed only in which of the following?