Standard Science Primary 5 Systems

Compared to inhaled air, exhaled air contains __________.

A more oxygen and less carbon dioxide
B less oxygen and more carbon dioxide
C the same amount of oxygen and nitrogen
D no oxygen at all
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Worked Solution

Step 1: We inhale air to take in oxygen for our body. Step 2: Cells use oxygen and produce carbon dioxide as waste. Step 3: Therefore, the air we breathe out has less oxygen and more carbon dioxide than the air we breathed in.

Correct answer: less oxygen and more carbon dioxide

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