$A$ : Different ecotypes of a species despite being genotypically different are interfertile.
$R$ : They are locally natural selections from a pool of genetic variations found in gene pool of a species.

Which one of the following correctly represents an organism and its ecological niche

Phenotypic variants formed in a population due to change in environment are called

Warm blooded animals like mammals from colder climates generally have shorter ear and limbs. This is an explanation of

Which of the following is correct