Biologyeasy · Past Paper
Which gas is essential for human breathing?
ACarbon dioxide
BNitrogen
COxygen
DHydrogen
✓ Correct Answer: C — Oxygen
Humans inhale oxygen which is used by cells for aerobic respiration to produce energy.
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✓ Correct Answer: C — Oxygen
Humans inhale oxygen which is used by cells for aerobic respiration to produce energy.
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