How do plants obtain oxygen for respiration?
A. Through photosynthesis
B. By taking it in through their leaves
C. By absorbing it from the soil
D. By obtaining it from the air through their roots
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How does the respiratory system in humans maintain the balance of oxygen and carbon dioxide in the body?
A. Through the process of gas exchange in the lungs
B. By filtering the air through the kidneys
C. By absorbing oxygen through the skin
D. By converting carbon dioxide into oxygen
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