Adaptation of a species is its

State Darwin's view on the role of variations in evolution.

Which of the following are correct examples of evolution by anthropogenic action?

Allopatric speciation is due to

What is it called when a part of a population migrates repeatedly to another population?

$I.$ Use and disuse of organs
$II.$ Inheritance of acquired characters
$III.$ Branching descent
$IV.$ Natural selection
$V.$ Mutation
$VI.$ Reproductive isolation
The two key concepts of Darwinism from the given options are