Which of the following describes the proper order of structures that an oxygen molecule diffuses through after entering the lungs?

Atrial depolarization
Atrial repolarization
Ventricular depolarization
Ventricular repolarization

the truman doctrine was an american foreign policy whose stated purpose was to counter soviet geopolitical expansion during the cold war. it was announced to congress by president harry s. truman on march 12, 1947, and further developed on july 12, 1948, when he pledged to contain threats to greece and turkey.

substitution is the answer in this case