Which of the following is related with reproductive isolation
Genetic isolation
Temporal isolation
Behavioural isolation
All of these
The epoch of human civilization is
$A$ : Due to bottle neck effect, among the survivors, certain alleles may be over represented, some may be underrepresented and some alleles may be totally eliminated.
$R$ : The path of extinction of a species cannot be reversed due to bottle neck effect
In evolution.......evolved $1st$ time in annelida