Earth is composed of three(3) compositional layers. Many scientists believe that as Earth cooled the denser materials sank to the center and the less dense materials rose to the top. The least dense layer is the...

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.