Initiating force of evolution is
Adaptation
Natural selection
Variation
Competition
(c) Evolution is generally progressive and for evolution the most important requirement is variation.
Name the type of natural selection depicted in the given diagram (type $I,$ type $II$ and type $III$)
$[Image]$
Type $I$ Type $II$ Type $III$
Definitions / Explanation: Gene Pool
''Migration may enhance or blurr the effects of selection''. Comment.
Primary source of allelic variation is
Gene pool is referred to