As per the modern synthetic theory,organic evolution depends upon:

Given below are two statements regarding evolution.
$Statement-I$: Selection against harmful mutation leads to a mutation balance.
$Statement-II$: In mutation balance, the allele frequency of harmful recessives keep on changing generation after generation.
In the light of above statements, choose the most appropriate answer from the options given below:

The scientist who proposed the theory of natural selection is $......$.

Hugo de Vries's experimental organism was

Genetic variation produced in species due to crossing over is an important process for which of the following?

The best description of natural selection is