Altitude Men Average number of red blood cells per mm of blood Women 5 million 4,5 million 6,2 million 5,8 million At sea level At 2000 metres above sea level muntom of yos draw a har graph to represent the state one way in which the reluability of the result was improved​

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