Artificial selection to obtain cows yielding higher milk output represents:

The initiating force of evolution is

The three natural processes that form the basis for evolution are

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

Given below are the two statements.
Statement $I$: Directional isolation favours the intermediate forms and eliminates both phenotypic extremes.
Statement $II$: In directional isolation,more individuals acquire a value other than the mean character value.
In the light of the above statements,choose the correct answer from the options given below:

In a gene pool,along with beneficial mutations,those mutations also exist which are damaging to an individual. It has been found that these mutations are often not eliminated from the population because:
$I.$ They have survival value.
$II.$ They are acquired.
$III.$ They are recessive and carried by heterozygous individuals.
$IV.$ They show genetic drift.
Choose the incorrect option$(s)$ regarding why these mutations persist in the gene pool.