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: Our bodies take in oxygen and release carbon dioxide during gas exchange. Step 2: Therefore, air leaving the body has less oxygen and more CO2 than when it entered.

Correct answer: less oxygen and more carbon dioxide

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