Question

9. Gas necessary for respiration is
(a) Nitrogen (b) Air
(C) Oxygen cos Carbon dioxide
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Answer 1

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(C) Oxygen cos Carbon dioxide

Mark Branilest.

Answer 2

Answer:

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Explanation:

Oxygen cos carbon-dioxide is the answer (Option C)

For more clarification:

All aerobic creatures need oxygen for cellular respiration, which uses the oxygen to break down foods for energy and produces carbon dioxide as a waste product. Breathing, or "external respiration", brings air into the lungs where gas exchange takes place in the alveoli through diffusion.