Advanced 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 and only carbon dioxide
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Worked Solution

Step 1: Inhaled air is rich in oxygen. Step 2: Body cells use oxygen and produce carbon dioxide. Step 3: Exhaled air reflects this change, having less oxygen and more carbon dioxide than what was taken in.

Correct answer: less oxygen and more carbon dioxide

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