Answer:
I believe the answer is true...
Explanation:
Answer: the first one is "lymphocytes"
the second one is "phagocytes"
Explanation: got it right.
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.
Endoskeleton I think it's a little hard to read this question
Answer:
The latest medical advances are too expensive for all but the most prosperous of Avalon's citizens.
