When you breath in, oxygen passes through the walls of the (tiny sac-like structures) and into the blood.
veins

arteries

trachea

alveoli

Click the button that shows the correct relationship of the electron affinities of the elements sodium and phosphorus. sodium’s electron affinity value is more negative than the electron affinity value of phosphorus. phosphorus’ electron affinity value is more negative than the electron affinity value of sodium. this information cannot be determined using the periodic table. answer is b on e2020.