Disadvantage of community service?

The distribution of related animals and plants across the world

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

Chloroplasts and bacteria are in size. a. similar b. at different ends of the size range c. exactly the same d. none of these