Adaptations of an animal are their:

The two key concepts of Darwinian theory of evolution are:

Darwin's theory of evolution was primarily based on which of the following concepts?

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.

The Darwinian variations are

What was the major contribution of the scientist August Weismann?