Standard Science Primary 5 Systems

Compared to inhaled air, exhaled air contains __________.

A More carbon dioxide and less oxygen
B Less carbon dioxide and more oxygen
C The same amount of nitrogen and oxygen
D No oxygen at all
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Worked Solution

Step 1: Body uses oxygen for respiration and produces carbon dioxide as waste. Step 2: Exhaled air reflects this exchange. Step 3: Oxygen decreases, CO2 increases.

Correct answer: More carbon dioxide and less oxygen

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