Why doesn't the moon move away from earth? its orbit is too small. its inertia is too strong. earth's gravity is strong. earth's gravity is weak.

Four types of motile cells in human body?

How do living things obtain phosphorus

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