What is hybrid breakdown a failure of?

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.

$XX$ is a type of selection process in evolution. $XX$ promotes population changes in one particular direction. $XX$ favours small or large-sized individuals,and the mean size of the population changes in $XX$. Identify $XX$.

Who stated that variations which are heritable and which make resource utilization better for few will enable only those to reproduce and leave more progeny?

Prodigality of reproduction in Darwinism refers to:

Adaptations of an animal are their: