Answer:
6 pm could be the time i sleep so ya i thing its it
Explanation:
Paint, crayons, markers, and colored pencils. There's so much to draw!
Answer:
respitory circulatory systems
Explanation:
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.
