Standard Science Primary 5 Systems

Which gas is higher in concentration in exhaled air compared to inhaled air?

A Noble Gases
B Oxygen
C Nitrogen
D Carbon Dioxide
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Worked Solution

Step 1: The body takes in oxygen and uses it for respiration. Step 2: Carbon dioxide is produced as a waste product. Step 3: Thus, exhaled air contains more carbon dioxide and less oxygen.

Correct answer: Carbon Dioxide

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