Answer:
Explanation:
Most limestones actually start as calcium carbonate mud or shells precipitated by organisms in reefs or shallow shelf regions - the biosphere. Over time, the limestone is broken down into its chemical parts and may come back to the surface as volcanic CO2 (in the atmosphere).
Capillaries are the end structures in the artery system that bring oxygenated blood from your lungs to the rest of your body.
Answer: no friction, metal
Explanation: yes
