I think either first or second grade
Answer:
OD
Explanation:
Its the best way of avoiding infection and to you yourself its the protective. measure
Aveoli are the small sacks in the lungs, where gases such as oxygen and carbon dioxide are transferred into/out of the blood stream. Blood would be the answer, as blood is not transferred through alveoli; it stays in blood vessels and is oxygenated at the alveoli.
Arthrotomy means cutting into a joint,Synosteotomy is the Main Term
