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.
True, The Sagrada Familia Cathedral will be under construction til 2026, it will take at least 144 years to build, they started building it 136 years ago.
Ícaro es un mito contemporáneo; es un auténtico mito de nuestro tiempo
