I am struggling please help if you are good in science

What is the main storage pool for phosphorus?

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.

What eventually happened to the carbon dioxide in the atmosphere of early earth? a. it dissolved into oceans, forming carbonate rocks. b. it dissolved into oceans and was used by sea creatures to create their shells. c. it was converted into oxygen and energy through the process of photosynthesis. d. it was removed from the atmosphere for all of the reasons listed above.