The importance of random accumulation of small genetic changes is sufficient to explain evolution. Who proposed this concept?

$A$ very important consequence of geographical isolation is ........

Identify the incorrect statement.

Select the incorrect statements:
$I.$ Natural selection is essential for evolution.
$II.$ Natural selection does not include variations.
$III.$ The concept of natural selection was given by Hugo de Vries.
$IV.$ Mutation is a sudden inheritable change.
$V.$ The synthetic theory is also called the Neo-Darwinism theory of evolution.

Mutational theory of evolution was given by

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