5. Which of the following constituents of air is used in respiration (a) Nitrogen (b) Oxygen (c) Carbon dioxide (d) Water vapour . C
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⠀⠀⠀Which of the following constituents of air is used in respiration (a) Nitrogen (b) Oxygen (c) Carbon dioxide (d) Water
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Which of the following constituents of air is used in respiration ?
(a) Nitrogen
(b) Oxygen
(c) Carbon dioxide
(d) Water vapour
Oxygen is used in respiration.
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