Which phrase best defines erosion? a. cementing layers of rock together to form stone b. moving bits of rock and soil from one place to another c. layering bits of rocks and soil d. breaking up rocks into smaller pieces

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