The surface of alveoli is thin and moist, alveoli has a very large surface area in total;plenty of room for gas exchange, and the surface of alveoli is covered with capillaries.
Answer:
I can't understand what you are saying
Explanation:
Las islas del delta y Tigre son lo que se llaman. ¡encantado de ayudar! :)
Answer: ¿De donde ERES tú?
Las ESTACIONES del año...
Explanation: I speak Spanish
