If the relative humidity of the air is 50 percent, how much water can the air hold? a. no more water b. twice as much water c. four times as much water d. eight times as much water

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.