In what way are the humerus and the femur similar? an x-ray of the human body showing the humerus and femur bones a. they both attach their respective limbs to the axial skeleton. b. they both have similar joints at each end. c. they both are extremely strong and made only of compact bone. d. they both have hollow spaces filled with bone-generating cells. e. they both protect vital organs.

The most appropriate answer would be option A.

The humerus and femur are the bones of the appendicular skeletal system.

They both attach their respective limbs to the axial skeletal.

The humerus is a long bone of the arms which connects it to the skeletal through scapula.  

Similarly, the femur is a long bone of the thigh which connects the lower limb with axial skeletal through the pelvic joint.

unicellular organisms, like bacteria, are able to perform all life functions within one single cell. multicellular organisms need many different types of cells to carry out the same life processes. each of these special types of cells has a different structure that it perform a specific function.