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Oxygen:
Oxygen is what is in the air that we breath. Oxygen (O2) is the good form of carbon dioxide (CO2).
We need oxygen to live. We breath in oxygen and out carbon dioxide.
Without oxygen, the alveoli would not be able to pass oxygen into your blood and then the blood would not make it to your heart.
Oxygen (02) is SUPER important! If there was none, the whole earth would explode (Without fire because fire needs oxygen to live).
This is a picture of air.
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