The evolution of species is based upon the sum total of the species' adaptive changes preserved by:

Natural selection where more individuals acquire specific character value other than the mean character value,leads to:

In a population of plants,some were extremely tall,and the remaining were extremely dwarf. No plants of the population showed intermediate height. The type of operation of natural selection in the above case is

Which of the following scientists believed in the concept of natural selection like Darwin?

Industrial melanism is an example of which of the following?

Given below are two statements.
Statement $I$ - According to Darwin,the gradual,inheritable variations over a long period of time lead to speciation.
Statement $II$ - According to Hugo de Vries,mutations are the cause of variations.
In the light of above statements,select the correct option given below: