Rate the body systems 1-9 from most important to least important I need someone’s opinion for a assignment (: (I’ll give points + brainalist for the correct answer)

Select the correct answer. 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.