Answer:
In humans, it's the femur
In many other mammals, the femur and humerus are of same length.
Explanation:
The upper bone of the leg is known as femur. It is also termed as thigh bone. Femur connects to tibia and fibula (the other leg bones). It is also the strongest bone in human body.
In several other mammals, the humerus(which is the bone of the upper arm) is of the same length as is the femur.
