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During the exchange of air in your lungs oxygen is being taken into your bloodstream while this substance is being released
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During the exchange of air in your lungs oxygen is being taken into your bloodstream while this substance is being released

User Wsmccusker
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2 Answers

4 votes

Answer:

carbon dioxide

Step-by-step explanation:

User Jeremy Moritz
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9 votes

Answer:

carbon dioxide

Step-by-step explanation:

trust

User Davidkelleher
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