Which statement applies only to the axial skeleton, not the appendicular skeleton?
a. it contains a pivot joint .
b. it has muscles attached that work in pairs .
c. it contains red bone marrow.
d. it possesses fossa for bone articulation.
e. it protects the heart and lungs.

E. It protects the heart and lungs

The human skeletal system is made up of two different type of skeleton namely axial skeleton and the appendicular skeleton. Among all the options given below, option E which states that it protects the organs such as hearts and lungs are specific to axial skeleton because it is involved in protection of internal organs whereas the appendicular skeletons aids in body movement.  

The appendicular skeletons region includes shoulder girdle, arms and forearms, hands, pelvis, thighs and legs, and feet and ankles.

The axial skeletons region includes skull, middle ear, ossicles, hyoid bone, rib cage, vertebral column, and sternum.  

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the solute can move "downhill," from regions of higher to lower concentration, relying on the specificity of the protein carrier to pass through the membrane. this process is called passive transport or facilitated diffusion, and does not require energy.