General ScienceCâu 65 / 120
Which gas do humans need to breathe in to survive?
a.Oxygen
b.Carbon dioxide
c.Nitrogen
d.Helium
Giải thích
The human respiratory system takes in oxygen, which cells use to release energy from food. Carbon dioxide is the waste gas that people breathe out.
Luyện miễn phí toàn bộ 120 câu hỏi — không cần đăng ký.
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