How does the mass of the moon support the idea of earths layers arranged by density

What is the name of the type of cell division that occurs in the prokaryotic cell cycle

What pattern of migration do whales follow?

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