Deep-bodied fish are common in coral reefs where species have to make quick turns in very tight spaces. Explain how body shape and fin arrangement in these species are related to movement in this type of habitat.

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