Animals and humans
breathe in oxygen.
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Animals and humans
breathe out
carbon dioxide.
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Respiration
carbon
dioxide (CO2)
oxygen (O2)
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Plants and trees take in
carbon dioxide.
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Plants and trees release oxygen.
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Photosynthesis
oxygen
(O2)
carbon dioxide
(CO2)
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The Oxygen Cycle
oxygen
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carbon dioxide
The Oxygen Cycle
oxygen
photosynthesis
respiration
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carbon dioxide