Darwin judged the fitness of an individual by

Identify $P, Q,$ and $R$ in the following descriptions of natural selection types:
$P -$ More individuals acquire peripheral character values at both ends of the distribution curve.
$Q -$ More individuals acquire mean character value.
$R -$ More individuals acquire value other than the mean character value.
$\quad\quad P \quad\quad\quad Q\quad\quad\quad R$

Allopatric speciation is due to

The ultimate source of organic evolution is

Differentiate between Lamarckism,Darwinism,and Mutation Theory.

The phrase 'Survival of the Fittest' was used by