Variations caused by mutation,as proposed by Hugo de Vries,are

The core essence of Darwinism regarding evolution is ........ .

The correct meaning of natural selection is

Select the correct statement regarding mutation theory of evolution.

$I.$ 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

Which of the following is associated with evolution?