ScienceCâu 70 / 120
Which gas do humans need to breathe in to survive?
a.Carbon dioxide
b.Oxygen
c.Nitrogen
d.Hydrogen
Giải thích
Humans inhale oxygen, which cells use to release energy from food through respiration. We exhale carbon dioxide as a waste product. Although nitrogen is the most abundant gas in air, the body does not use it for respiration.
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