the femur is the thighbone & there is only 1 per thigh. the lower leg has 2 bones: the tibia & the fibula.
A BONE IN THE BODY.
femurs are the biggest bones in the body which are in your leg and also in Egypt they needed big femurs to make pyramids and stuff
I don't know
The Femur belongs to the skelital and the circulatory system because new red blood cells are formed in the marrow of the femur.