Answer: A
Explanation: The blood–air barrier (alveolar–capillary barrier or membrane) exists in the gas exchanging region of the lungs. It exists to prevent air bubbles from forming in the blood, and from blood entering the alveoli. ... The barrier is permeable to molecular oxygen, carbon dioxide, carbon monoxide and many other gases.
Answer:
calm down and try to keep your distance from them to not hurt yourself. thats if u feel embarrased.
Explanation:
im sry thats all i can think.<3
I think it's C,21 day or....etc.If not than it's def. Zumba( it might be Zumba)
Answer:
he simply means he should try harder and probably he is not feeling well
