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OpenStudy (anonymous):
Carbon dioxide is returned to the atmosphere when
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OpenStudy (anonymous):
1. Burn something 2. Living things breathe in oxygen and exhale carbon dioxide. 3. Chemical reactions (vinegar and baking soda) 4. Come out of solution in water (dissolved gas).
OpenStudy (anonymous):
I knew exhaling was an answer and that it wasn't the only one. thanks for that @snapbacklive
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