Heat and moisture are distributed around the earth are called

What type of competition exsist between two species. turtles and fish

Which of the following is a testable hypotheses?

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