If an organism displays a trait or does not display a trait, what can we say about that trait? a. it is polygenic b. it has mutated c. it is controlled by one gene

Asquirrel population lives in an area. over many years, a river in that area grows wider and stronger, eventually forming a canyon. the squirrel populations on the two sides of the canyon can no longer mate with each other and ultimately form distinct species. this is an example of