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Gaseous exchange in animals and plants

Gaseous exchange in animals and plants. 7 . 5. Respiration. Unbreathed air. nitrogen (78%). oxygen (21%). carbon dioxide (0.03%). 3. Respiration. Breathed air. nitrogen (78%). oxygen (21%). carbon dioxide (0.03%). 4. Respiration. Unbreathed air. Breathed air. less oxygen.

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Gaseous exchange in animals and plants