A(n) is the joining together of blood vessels.

The answer to the blank provided which asks about the joining of blood vessels is called anastomosis. Anastomosis is subdivided int two parts: Arterial anastomosis and Venous anastomosis. Arterial Anastomosis includes joining two or more arteries converging to the same region while Venous anastomosis  includes two or more vein discharging the same region.

It depends on the surface of the levels. the rougher the surface, the greater is the frictional force. for rougher surfaces, you would need to exert greater force to move the object. the concept is that, you must overcome the frictional force in order to bring the object into motion. this is the reason why we add lubricants to the joints so they could easily move. this answer was on