ScienceCâu 106 / 120
What gas do humans breathe in that is essential for cellular respiration?
a.Carbon dioxide
b.Oxygen
c.Nitrogen
d.Helium
Giải thích
Cells use oxygen to break down glucose and release energy during cellular respiration. Humans inhale oxygen and exhale carbon dioxide as a waste product.
Luyện miễn phí toàn bộ 120 câu hỏi — không cần đăng ký.
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