Organize the items listed into the proper sequence of events for gas exchange.
a: o2 is transported to cells by circulatory system.
b: o2 is drawn into the lungs during inhalation.
c: cells use o2 and generate co2.
d: co2 is exhaled.
e: the circulatory system transports co2 to the lungs.

The correct order is O2 is drawn into the lungs during inhalation (b), O2 is transported to cells (a) cells use O2 and generate CO2 (c), the circulatory system transports CO2 to the lung (e) and CO2 is exhaled (d).

In conclusion, the correct order is O2 is drawn into the lungs during inhalation (b), O2 is transported to cells (a) cells use O2 and generate CO2 (c), the circulatory system transports CO2 to the lung (e) and CO2 is exhaled (d).

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